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World War II

"The Second World War" and "WWII" redirect here. For other uses, see The Second World War (disambiguation), WWII (disambiguation), and World War II (disambiguation).

World War II or the Second World War, often abbreviated as WWII or WW2, was a global war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing military alliances: the Allies and the Axis powers. In a total war directly involving more than 100 million personnel from more than 30 countries, the major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. Aircraft played a major role in the conflict, enabling the strategic bombing of population centres and the only two uses of nuclear weapons in war to this day. World War II was by far the deadliest conflict in human history; it resulted in 70 to 85 million fatalities, a majority being civilians. Tens of millions of people died due to genocides (including the Holocaust), starvation, massacres, and disease. In the wake of the Axis defeat, Germany and Japan were occupied, and war crimes tribunals were conducted against German and Japanese leaders.

World War II
Clockwise from top left:
Date
  • 1 September 1939 – 2 September 1945 (1939-09-011945-09-02)
  • (6 years and 1 day)
Location
Result
Participants
Allies Axis
Commanders and leaders
Main Allied leaders: Main Axis leaders:
Casualties and losses
  • Military dead:
  • Over 16,000,000
  • Civilian dead:
  • Over 45,000,000
  • Total dead:
  • Over 61,000,000
  • (1937–1945)
  • ...further details
  • Military dead:
  • Over 8,000,000
  • Civilian dead:
  • Over 4,000,000
  • Total dead:
  • Over 12,000,000
  • (1937–1945)
  • ...further details

World War II is generally considered to have begun on 1 September 1939, when Nazi Germany, under Adolf Hitler, invaded Poland. The United Kingdom and France subsequently declared war on Germany on 3 September. Under the Molotov–Ribbentrop Pact of August 1939, Germany and the Soviet Union had partitioned Poland and marked out their "spheres of influence" across Finland, Romania and the Baltic states. From late 1939 to early 1941, in a series of campaigns and treaties, Germany conquered or controlled much of continental Europe, and formed the Axis alliance with Italy and Japan (along with other countries later on). Following the onset of campaigns in North Africa and East Africa, and the fall of France in mid-1940, the war continued primarily between the European Axis powers and the British Empire, with war in the Balkans, the aerial Battle of Britain, the Blitz of the UK, and the Battle of the Atlantic. On 22 June 1941, Germany led the European Axis powers in an invasion of the Soviet Union, opening the Eastern Front, the largest land theatre of war in history and trapping the Axis powers, crucially the German Wehrmacht, in a war of attrition.

Japan, which aimed to dominate Asia and the Pacific, was at war with the Republic of China by 1937. In December 1941, Japan attacked American and British territories with near-simultaneous offensives against Southeast Asia and the Central Pacific, including an attack on the US fleet at Pearl Harbor which forced the US to declare war against Japan; the European Axis powers declared war on the US in solidarity. Japan soon captured much of the western Pacific, but its advances were halted in 1942 after losing the critical Battle of Midway; later, Germany and Italy were defeated in North Africa and at Stalingrad in the Soviet Union. Key setbacks in 1943—including a series of German defeats on the Eastern Front, the Allied invasions of Sicily and the Italian mainland, and Allied offensives in the Pacific—cost the Axis powers their initiative and forced it into strategic retreat on all fronts. In 1944, the Western Allies invaded German-occupied France, while the Soviet Union regained its territorial losses and turned towards Germany and its allies. During 1944 and 1945, Japan suffered reversals in mainland Asia, while the Allies crippled the Japanese Navy and captured key western Pacific islands.

The war in Europe concluded with the liberation of German-occupied territories, and the invasion of Germany by the Western Allies and the Soviet Union, culminating in the fall of Berlin to Soviet troops, Hitler's suicide and the German unconditional surrender on 8 May 1945. Following the Potsdam Declaration by the Allies on 26 July 1945 and the refusal of Japan to surrender on its terms, the United States dropped the first atomic bombs on the Japanese cities of Hiroshima, on 6 August, and Nagasaki, on 9 August. Faced with an imminent invasion of the Japanese archipelago, the possibility of additional atomic bombings, and the Soviet entry into the war against Japan and its invasion of Manchuria, Japan announced its intention to surrender on 15 August, then signed the surrender document on 2 September 1945, cementing total victory in Asia for the Allies.

World War II changed the political alignment and social structure of the globe. The United Nations (UN) was established to foster international co-operation and prevent future conflicts, and the victorious great powers—China, France, the Soviet Union, the United Kingdom, and the United States—became the permanent members of its Security Council. The Soviet Union and the United States emerged as rival superpowers, setting the stage for the nearly half-century-long Cold War. In the wake of European devastation, the influence of its great powers waned, triggering the decolonisation of Africa and Asia. Most countries whose industries had been damaged moved towards economic recovery and expansion. Political integration, especially in Europe, began as an effort to forestall future hostilities, end pre-war enmities and forge a sense of common identity.

Contents

It is generally considered that in Europe World War II started on 1 September 1939, beginning with the German invasion of Poland and the United Kingdom and France's declaration of war on Germany two days later. The dates for the beginning of the war in the Pacific include the start of the Second Sino-Japanese War on 7 July 1937, or the earlier Japanese invasion of Manchuria, on 19 September 1931. Others follow the British historian A. J. P. Taylor, who held that the Sino-Japanese War and war in Europe and its colonies occurred simultaneously, and the two wars became World War II in 1941. Other starting dates sometimes used for World War II include the Italian invasion of Abyssinia on 3 October 1935. The British historian Antony Beevor views the beginning of World WarII as the Battles of Khalkhin Gol fought between Japan and the forces of Mongolia and the Soviet Union from May to September 1939. Others view the Spanish Civil War as the start or prelude to World War II.

The exact date of the war's end is also not universally agreed upon. It was generally accepted at the time that the war ended with the armistice of 14 August 1945 (V-J Day), rather than with the formal surrender of Japan on 2 September 1945, which officially ended the war in Asia. A peace treaty between Japan and the Allies was signed in 1951. A 1990 treaty regarding Germany's future allowed the reunification of East and West Germany to take place and resolved most post-World WarII issues. No formal peace treaty between Japan and the Soviet Union was ever signed, although the state of war between the two countries was terminated by the Soviet–Japanese Joint Declaration of 1956, which also restored full diplomatic relations between them.

Europe

World War I had radically altered the political European map, with the defeat of the Central Powers—including Austria-Hungary, Germany, Bulgaria and the Ottoman Empire—and the 1917 Bolshevik seizure of power in Russia, which led to the founding of the Soviet Union. Meanwhile, the victorious Allies of World War I, such as France, Belgium, Italy, Romania, and Greece, gained territory, and new nation-states were created out of the collapse of Austria-Hungary and the Ottoman and Russian Empires.

The League of Nations assembly, held in Geneva, Switzerland, 1930

To prevent a future world war, the League of Nations was created during the 1919 Paris Peace Conference. The organisation's primary goals were to prevent armed conflict through collective security, military and naval disarmament, and settling international disputes through peaceful negotiations and arbitration.

Despite strong pacifist sentiment after World WarI, irredentist and revanchist nationalism emerged in several European states in the same period. These sentiments were especially marked in Germany because of the significant territorial, colonial, and financial losses imposed by the Treaty of Versailles. Under the treaty, Germany lost around 13 percent of its home territory and all its overseas possessions, while German annexation of other states was prohibited, reparations were imposed, and limits were placed on the size and capability of the country's armed forces.

The German Empire was dissolved in the German Revolution of 1918–1919, and a democratic government, later known as the Weimar Republic, was created. The interwar period saw strife between supporters of the new republic and hardline opponents on both the right and left. Italy, as an Entente ally, had made some post-war territorial gains; however, Italian nationalists were angered that the promises made by the United Kingdom and France to secure Italian entrance into the war were not fulfilled in the peace settlement. From 1922 to 1925, the Fascist movement led by Benito Mussolini seized power in Italy with a nationalist, totalitarian, and class collaborationist agenda that abolished representative democracy, repressed socialist, left-wing and liberal forces, and pursued an aggressive expansionist foreign policy aimed at making Italy a world power, and promising the creation of a "New Roman Empire".

Adolf Hitler at a German Nazi political rally in Nuremberg, August 1933

Adolf Hitler, after an unsuccessful attempt to overthrow the German government in 1923, eventually became the Chancellor of Germany in 1933 when Paul Von Hindenburg and the Reichstag appointed him. He abolished democracy, espousing a radical, racially motivated revision of the world order, and soon began a massive rearmament campaign. Meanwhile, France, to secure its alliance, allowed Italy a free hand in Ethiopia, which Italy desired as a colonial possession. The situation was aggravated in early 1935 when the Territory of the Saar Basin was legally reunited with Germany, and Hitler repudiated the Treaty of Versailles, accelerated his rearmament programme, and introduced conscription.

The United Kingdom, France and Italy formed the Stresa Front in April 1935 in order to contain Germany, a key step towards military globalisation; however, that June, the United Kingdom made an independent naval agreement with Germany, easing prior restrictions. The Soviet Union, concerned by Germany's goals of capturing vast areas of Eastern Europe, drafted a treaty of mutual assistance with France. Before taking effect, though, the Franco-Soviet pact was required to go through the bureaucracy of the League of Nations, which rendered it essentially toothless. The United States, concerned with events in Europe and Asia, passed the Neutrality Act in August of the same year.

Hitler defied the Versailles and Locarno treaties by remilitarising the Rhineland in March 1936, encountering little opposition due to the policy of appeasement. In October 1936, Germany and Italy formed the Rome–Berlin Axis. A month later, Germany and Japan signed the Anti-Comintern Pact, which Italy joined the following year.

Asia

The Kuomintang (KMT) party in China launched a unification campaign against regional warlords and nominally unified China in the mid-1920s, but was soon embroiled in a civil war against its former Chinese Communist Party allies and new regional warlords. In 1931, an increasingly militaristic Empire of Japan, which had long sought influence in China as the first step of what its government saw as the country's right to rule Asia, staged the Mukden Incident as a pretext to invade Manchuria and establish the puppet state of Manchukuo.

China appealed to the League of Nations to stop the Japanese invasion of Manchuria. Japan withdrew from the League of Nations after being condemned for its incursion into Manchuria. The two nations then fought several battles, in Shanghai, Rehe and Hebei, until the Tanggu Truce was signed in 1933. Thereafter, Chinese volunteer forces continued the resistance to Japanese aggression in Manchuria, and Chahar and Suiyuan. After the 1936 Xi'an Incident, the Kuomintang and communist forces agreed on a ceasefire to present a united front to oppose Japan.

Italian invasion of Ethiopia (1935)

Benito Mussolini inspecting troops during the Italo-Ethiopian War, 1935

The Second Italo-Ethiopian War was a brief colonial war that began in October 1935 and ended in May 1936. The war began with the invasion of the Ethiopian Empire (also known as Abyssinia) by the armed forces of the Kingdom of Italy (Regno d'Italia), which was launched from Italian Somaliland and Eritrea. The war resulted in the military occupation of Ethiopia and its annexation into the newly created colony of Italian East Africa (Africa Orientale Italiana, or AOI); in addition it exposed the weakness of the League of Nations as a force to preserve peace. Both Italy and Ethiopia were member nations, but the League did little when the former clearly violated Article X of the League's Covenant. The United Kingdom and France supported imposing sanctions on Italy for the invasion, but the sanctions were not fully enforced and failed to end the Italian invasion. Italy subsequently dropped its objections to Germany's goal of absorbing Austria.

Spanish Civil War (1936–1939)

Main article: Spanish Civil War
The bombing of Guernica in 1937, during the Spanish Civil War, sparked fears abroad in Europe that the next war would be based on bombing of cities with very high civilian casualties.

When civil war broke out in Spain, Hitler and Mussolini lent military support to the Nationalist rebels, led by General Francisco Franco. Italy supported the Nationalists to a greater extent than the Nazis did: altogether Mussolini sent to Spain more than 70,000 ground troops and 6,000 aviation personnel, as well as about 720 aircraft. The Soviet Union supported the existing government of the Spanish Republic. More than 30,000 foreign volunteers, known as the International Brigades, also fought against the Nationalists. Both Germany and the Soviet Union used this proxy war as an opportunity to test in combat their most advanced weapons and tactics. The Nationalists won the civil war in April 1939; Franco, now dictator, remained officially neutral during World WarII but generally favoured the Axis. His greatest collaboration with Germany was the sending of volunteers to fight on the Eastern Front.

Japanese invasion of China (1937)

Japanese Imperial Army soldiers during the Battle of Shanghai, 1937

In July 1937, Japan captured the former Chinese imperial capital of Peking after instigating the Marco Polo Bridge Incident, which culminated in the Japanese campaign to invade all of China. The Soviets quickly signed a non-aggression pact with China to lend materiel support, effectively ending China's prior co-operation with Germany. From September to November, the Japanese attacked Taiyuan, engaged the Kuomintang Army around Xinkou, and fought Communist forces in Pingxingguan. Generalissimo Chiang Kai-shek deployed his best army to defend Shanghai, but after three months of fighting, Shanghai fell. The Japanese continued to push the Chinese forces back, capturing the capital Nanking in December 1937. After the fall of Nanking, tens or hundreds of thousands of Chinese civilians and disarmed combatants were murdered by the Japanese.

In March 1938, Nationalist Chinese forces won their first major victory at Taierzhuang, but then the city of Xuzhou was taken by the Japanese in May. In June 1938, Chinese forces stalled the Japanese advance by flooding the Yellow River; this manoeuvre bought time for the Chinese to prepare their defences at Wuhan, but the city was taken by October. Japanese military victories did not bring about the collapse of Chinese resistance that Japan had hoped to achieve; instead, the Chinese government relocated inland to Chongqing and continued the war.

Soviet–Japanese border conflicts

Red Army artillery unit during the Battle of Lake Khasan, 1938

In the mid-to-late 1930s, Japanese forces in Manchukuo had sporadic border clashes with the Soviet Union and Mongolia. The Japanese doctrine of Hokushin-ron, which emphasised Japan's expansion northward, was favoured by the Imperial Army during this time. With the Japanese defeat at Khalkin Gol in 1939, the ongoing Second Sino-Japanese War and ally Nazi Germany pursuing neutrality with the Soviets, this policy would prove difficult to maintain. Japan and the Soviet Union eventually signed a Neutrality Pact in April 1941, and Japan adopted the doctrine of Nanshin-ron, promoted by the Navy, which took its focus southward, eventually leading to its war with the United States and the Western Allies.

European occupations and agreements

Chamberlain, Daladier, Hitler, Mussolini, and Ciano pictured just before signing the Munich Agreement, 29 September 1938

In Europe, Germany and Italy were becoming more aggressive. In March 1938, Germany annexed Austria, again provoking little response from other European powers. Encouraged, Hitler began pressing German claims on the Sudetenland, an area of Czechoslovakia with a predominantly ethnic German population. Soon the United Kingdom and France followed the appeasement policy of British Prime Minister Neville Chamberlain and conceded this territory to Germany in the Munich Agreement, which was made against the wishes of the Czechoslovak government, in exchange for a promise of no further territorial demands. Soon afterwards, Germany and Italy forced Czechoslovakia to cede additional territory to Hungary, and Poland annexed Czechoslovakia's Zaolzie region.

Although all of Germany's stated demands had been satisfied by the agreement, privately Hitler was furious that British interference had prevented him from seizing all of Czechoslovakia in one operation. In subsequent speeches Hitler attacked British and Jewish "war-mongers" and in January 1939 secretly ordered a major build-up of the German navy to challenge British naval supremacy. In March 1939, Germany invaded the remainder of Czechoslovakia and subsequently split it into the German Protectorate of Bohemia and Moravia and a pro-German client state, the Slovak Republic. Hitler also delivered an ultimatum to Lithuania on 20 March 1939, forcing the concession of the Klaipėda Region, formerly the German Memelland.

German Foreign Minister Joachim von Ribbentrop (right) and the Soviet leader Joseph Stalin, after signing the Molotov–Ribbentrop Pact, 23 August 1939

Greatly alarmed and with Hitler making further demands on the Free City of Danzig, the United Kingdom and France guaranteed their support for Polish independence; when Italy conquered Albania in April 1939, the same guarantee was extended to the Kingdoms of Romania and Greece. Shortly after the Franco-British pledge to Poland, Germany and Italy formalised their own alliance with the Pact of Steel. Hitler accused the United Kingdom and Poland of trying to "encircle" Germany and renounced the Anglo-German Naval Agreement and the German–Polish Non-Aggression Pact.

The situation reached a general crisis in late August as German troops continued to mobilise against the Polish border. On 23 August, when tripartite negotiations about a military alliance between France, the United Kingdom and Soviet Union stalled, the Soviet Union signed a non-aggression pact with Germany. This pact had a secret protocol that defined German and Soviet "spheres of influence" (western Poland and Lithuania for Germany; eastern Poland, Finland, Estonia, Latvia and Bessarabia for the Soviet Union), and raised the question of continuing Polish independence. The pact neutralised the possibility of Soviet opposition to a campaign against Poland and assured that Germany would not have to face the prospect of a two-front war, as it had in World WarI. Immediately after that, Hitler ordered the attack to proceed on 26 August, but upon hearing that the United Kingdom had concluded a formal mutual assistance pact with Poland and that Italy would maintain neutrality, he decided to delay it.

In response to British requests for direct negotiations to avoid war, Germany made demands on Poland, which only served as a pretext to worsen relations. On 29 August, Hitler demanded that a Polish plenipotentiary immediately travel to Berlin to negotiate the handover of Danzig, and to allow a plebiscite in the Polish Corridor in which the German minority would vote on secession. The Poles refused to comply with the German demands, and on the night of 30–31 August in a stormy meeting with the British ambassador Nevile Henderson, Ribbentrop declared that Germany considered its claims rejected.

War breaks out in Europe (1939–40)

Soldiers of the German Wehrmacht tearing down the border crossing into Poland, 1 September 1939

On 1 September 1939, Germany invaded Poland after having staged several false flag border incidents as a pretext to initiate the invasion. The first German attack of the war came against the Polish defenses at Westerplatte. The United Kingdom responded with an ultimatum to Germany to cease military operations, and on 3 September, after the ultimatum was ignored, Britain and France declared war on Germany, followed by Australia, New Zealand, South Africa and Canada. The alliance provided no direct military support to Poland, outside of a cautious French probe into the Saarland. The Western Allies also began a naval blockade of Germany, which aimed to damage the country's economy and the war effort. Germany responded by ordering U-boat warfare against Allied merchant and warships, which would later escalate into the Battle of the Atlantic.

Soldiers of the Polish Army during the defence of Poland, September 1939

On 8 September, German troops reached the suburbs of Warsaw. The Polish counter offensive to the west halted the German advance for several days, but it was outflanked and encircled by the Wehrmacht. Remnants of the Polish army broke through to besieged Warsaw. On 17 September 1939, after signing a cease-fire with Japan, the Soviet Union invaded Eastern Poland under a pretext that the Polish state had ostensibly ceased to exist. On 27 September, the Warsaw garrison surrendered to the Germans, and the last large operational unit of the Polish Army surrendered on 6October. Despite the military defeat, Poland never surrendered; instead, it formed the Polish government-in-exile and a clandestine state apparatus remained in occupied Poland. A significant part of Polish military personnel evacuated to Romania and the Baltic countries; many of them later fought against the Axis in other theatres of the war.

Germany annexed the western and occupied the central part of Poland, and the Soviet Union annexed its eastern part; small shares of Polish territory were transferred to Lithuania and Slovakia. On 6 October, Hitler made a public peace overture to the United Kingdom and France but said that the future of Poland was to be determined exclusively by Germany and the Soviet Union. The proposal was rejected, and Hitler ordered an immediate offensive against France, which was postponed until the spring of 1940 due to bad weather.

Finnish machine gun nest aimed at Soviet Red Army positions during the Winter War, February 1940

The Soviet Union forced the Baltic countries—Estonia, Latvia and Lithuania, which were in the Soviet "sphere of influence" under the Molotov-Ribbentrop pact—to sign "mutual assistance pacts" that stipulated stationing Soviet troops in these countries. Soon after, significant Soviet military contingents were moved there. Finland refused to sign a similar pact and rejected ceding part of its territory to the Soviet Union. The Soviet Union invaded Finland in November 1939, and the Soviet Union was expelled from the League of Nations. Despite overwhelming numerical superiority, Soviet military success was modest, but the Finno-Soviet war ended in March 1940 with fairly significant Finnish concessions.

In June 1940, the Soviet Union forcibly annexed Estonia, Latvia and Lithuania, and the Romanian regions of Bessarabia, Northern Bukovina and the Hertsa region. Meanwhile, Nazi-Soviet political rapprochement and economic co-operation gradually stalled, and both states began preparations for war.

Western Europe (1940–41)

German advance into Belgium and Northern France, 10 May-4 June 1940, swept past the Maginot Line (shown in dark red)

In April 1940, Germany invaded Denmark and Norway to protect shipments of iron ore from Sweden, which the Allies were attempting to cut off. Denmark capitulated after a few hours, and Norway was conquered within two months despite Allied support. British discontent over the Norwegian campaign led to the appointment of Winston Churchill as Prime Minister on 10May 1940.

On the same day, Germany launched an offensive against France. To circumvent the strong Maginot Line fortifications on the Franco-German border, Germany directed its attack at the neutral nations of Belgium, the Netherlands, and Luxembourg. The Germans carried out a flanking manoeuvre through the Ardennes region, which was mistakenly perceived by Allies as an impenetrable natural barrier against armoured vehicles. By successfully implementing new blitzkrieg tactics, the Wehrmacht rapidly advanced to the Channel and cut off the Allied forces in Belgium, trapping the bulk of the Allied armies in a cauldron on the Franco-Belgian border near Lille. The United Kingdom was able to evacuate a significant number of Allied troops from the continent by early June, although abandoning almost all their equipment.

On 10 June, Italy invaded France, declaring war on both France and the United Kingdom. The Germans turned south against the weakened French army, and Paris fell to them on 14June. Eight days later France signed an armistice with Germany; it was divided into German and Italian occupation zones, and an unoccupied rump state under the Vichy Regime, which, though officially neutral, was generally aligned with Germany. France kept its fleet, which the United Kingdom attacked on 3July in an attempt to prevent its seizure by Germany.

London seen from St. Paul's Cathedral after the German Blitz, 29 December 1940

The air Battle of Britain began in early July with Luftwaffe attacks on shipping and harbours. The United Kingdom rejected Hitler's peace offer, and the German air superiority campaign started in August but failed to defeat RAF Fighter Command, forcing the indefinite postponement of the proposed German invasion of Britain. The German strategic bombing offensive intensified with night attacks on London and other cities in the Blitz, but failed to significantly disrupt the British war effort and largely ended in May 1941.

Using newly captured French ports, the German Navy enjoyed success against an over-extended Royal Navy, using U-boats against British shipping in the Atlantic. The British Home Fleet scored a significant victory on 27May 1941 by sinking the German battleship Bismarck.

In November 1939, the United States was taking measures to assist China and the Western Allies and amended the Neutrality Act to allow "cash and carry" purchases by the Allies. In 1940, following the German capture of Paris, the size of the United States Navy was significantly increased. In September the United States further agreed to a trade of American destroyers for British bases. Still, a large majority of the American public continued to oppose any direct military intervention in the conflict well into 1941. In December 1940 Roosevelt accused Hitler of planning world conquest and ruled out any negotiations as useless, calling for the United States to become an "arsenal of democracy" and promoting Lend-Lease programmes of aid to support the British war effort. The United States started strategic planning to prepare for a full-scale offensive against Germany.

At the end of September 1940, the Tripartite Pact formally united Japan, Italy, and Germany as the Axis powers. The Tripartite Pact stipulated that any country, with the exception of the Soviet Union, which attacked any Axis Power would be forced to go to war against all three. The Axis expanded in November 1940 when Hungary, Slovakia and Romania joined. Romania and Hungary later made major contributions to the Axis war against the Soviet Union, in Romania's case partially to recapture territory ceded to the Soviet Union.

Mediterranean (1940–41)

Soldiers of the British Commonwealth forces from the Australian Army's 9th Division during the Siege of Tobruk; North African Campaign, August 1941

In early June 1940, the Italian Regia Aeronautica attacked and besieged Malta, a British possession. From late summer to early autumn, Italy conquered British Somaliland and made an incursion into British-held Egypt. In October, Italy attacked Greece, but the attack was repulsed with heavy Italian casualties; the campaign ended within months with minor territorial changes. Germany started preparation for an invasion of the Balkans to assist Italy, to prevent the British from gaining a foothold there, which would be a potential threat for Romanian oil fields, and to strike against the British dominance of the Mediterranean.

In December 1940, British Empire forces began counter-offensives against Italian forces in Egypt and Italian East Africa. The offensives were highly successful; by early February 1941, Italy had lost control of eastern Libya, and large numbers of Italian troops had been taken prisoner. The Italian Navy also suffered significant defeats, with the Royal Navy putting three Italian battleships out of commission by means of a carrier attack at Taranto, and neutralising several more warships at the Battle of Cape Matapan.

German Panzer III of the Afrika Korps advancing across the North African desert, 1941

Italian defeats prompted Germany to deploy an expeditionary force to North Africa and at the end of March 1941, Rommel's Afrika Korps launched an offensive which drove back the Commonwealth forces. In under a month, Axis forces advanced to western Egypt and besieged the port of Tobruk.

By late March 1941, Bulgaria and Yugoslavia signed the Tripartite Pact; however, the Yugoslav government was overthrown two days later by pro-British nationalists. Germany responded with simultaneous invasions of both Yugoslavia and Greece, commencing on 6 April 1941; both nations were forced to surrender within the month. The airborne invasion of the Greek island of Crete at the end of May completed the German conquest of the Balkans. Although the Axis victory was swift, bitter and large-scale partisan warfare subsequently broke out against the Axis occupation of Yugoslavia, which continued until the end of the war.

In the Middle East in May, Commonwealth forces quashed an uprising in Iraq which had been supported by German aircraft from bases within Vichy-controlled Syria. Between June and July, they invaded and occupied the French possessions Syria and Lebanon, with the assistance of the Free French.

Axis attack on the Soviet Union (1941)

European theatre of World War II animation map, 1939–1945 – Red: Western Allies and the Soviet Union after 1941; Green: Soviet Union before 1941; Blue: Axis powers

With the situation in Europe and Asia relatively stable, Germany, Japan, and the Soviet Union made preparations. With the Soviets wary of mounting tensions with Germany and the Japanese planning to take advantage of the European War by seizing resource-rich European possessions in Southeast Asia, the two powers signed the Soviet–Japanese Neutrality Pact in April 1941. By contrast, the Germans were steadily making preparations for an attack on the Soviet Union, massing forces on the Soviet border.

Hitler believed that the United Kingdom's refusal to end the war was based on the hope that the United States and the Soviet Union would enter the war against Germany sooner or later. He, therefore, decided to try to strengthen Germany's relations with the Soviets or failing that to attack and eliminate them as a factor. In November 1940, negotiations took place to determine if the Soviet Union would join the Tripartite Pact. The Soviets showed some interest but asked for concessions from Finland, Bulgaria, Turkey, and Japan that Germany considered unacceptable. On 18 December 1940, Hitler issued the directive to prepare for an invasion of the Soviet Union.

German soldiers during the invasion of the Soviet Union by the Axis powers, 1941

On 22 June 1941, Germany, supported by Italy and Romania, invaded the Soviet Union in Operation Barbarossa, with Germany accusing the Soviets of plotting against them. They were joined shortly by Finland and Hungary. The primary targets of this surprise offensive were the Baltic region, Moscow and Ukraine, with the ultimate goal of ending the 1941 campaign near the Arkhangelsk-Astrakhan line, from the Caspian to the White Seas. Hitler's objectives were to eliminate the Soviet Union as a military power, exterminate Communism, generate Lebensraum ("living space") by dispossessing the native population and guarantee access to the strategic resources needed to defeat Germany's remaining rivals.

Although the Red Army was preparing for strategic counter-offensives before the war, Barbarossa forced the Soviet supreme command to adopt a strategic defence. During the summer, the Axis made significant gains into Soviet territory, inflicting immense losses in both personnel and materiel. By mid-August, however, the German Army High Command decided to suspend the offensive of a considerably depleted Army Group Centre, and to divert the 2nd Panzer Group to reinforce troops advancing towards central Ukraine and Leningrad. The Kiev offensive was overwhelmingly successful, resulting in encirclement and elimination of four Soviet armies, and made possible further advance into Crimea and industrially developed Eastern Ukraine (the First Battle of Kharkov).

Soviet civilians leaving destroyed houses after a German bombardment during the Battle of Leningrad, 10 December 1942

The diversion of three quarters of the Axis troops and the majority of their air forces from France and the central Mediterranean to the Eastern Front prompted the United Kingdom to reconsider its grand strategy. In July, the UK and the Soviet Union formed a military alliance against Germany and in August, the United Kingdom and the United States jointly issued the Atlantic Charter, which outlined British and American goals for the postwar world. In late August the British and Soviets invaded neutral Iran to secure the Persian Corridor, Iran's oil fields, and preempt any Axis advances through Iran toward the Baku oil fields or British India.

By October Axis operational objectives in Ukraine and the Baltic region were achieved, with only the sieges of Leningrad and Sevastopol continuing. A major offensive against Moscow was renewed; after two months of fierce battles in increasingly harsh weather, the German army almost reached the outer suburbs of Moscow, where the exhausted troops were forced to suspend their offensive. Large territorial gains were made by Axis forces, but their campaign had failed to achieve its main objectives: two key cities remained in Soviet hands, the Soviet capability to resist was not broken, and the Soviet Union retained a considerable part of its military potential. The blitzkrieg phase of the war in Europe had ended.

By early December, freshly mobilised reserves allowed the Soviets to achieve numerical parity with Axis troops. This, as well as intelligence data which established that a minimal number of Soviet troops in the East would be sufficient to deter any attack by the Japanese Kwantung Army, allowed the Soviets to begin a massive counter-offensive that started on 5 December all along the front and pushed German troops 100–250 kilometres (62–155 mi) west.

War breaks out in the Pacific (1941)

Main article: Pacific War

Following the Japanese false flag Mukden Incident in 1931, the Japanese shelling of the American gunboat USS Panay in 1937, and the 1937-38 Nanjing Massacre, Japanese-American relations deteriorated. In 1939, the United States notified Japan that it would not be extending its trade treaty and American public opinion opposing Japanese expansionism led to a series of economic sanctions, the Export Control Acts, which banned U.S. exports of chemicals, minerals and military parts to Japan and increased economic pressure on the Japanese regime. During 1939 Japan launched its first attack against Changsha, a strategically important Chinese city, but was repulsed by late September. Despite several offensives by both sides, the war between China and Japan was stalemated by 1940. To increase pressure on China by blocking supply routes, and to better position Japanese forces in the event of a war with the Western powers, Japan invaded and occupied northern Indochina in September 1940.

Japanese soldiers entering Hong Kong, 8 December 1941

Chinese nationalist forces launched a large-scale counter-offensive in early 1940. In August, Chinese communists launched an offensive in Central China; in retaliation, Japan instituted harsh measures in occupied areas to reduce human and material resources for the communists. The continued antipathy between Chinese communist and nationalist forces culminated in armed clashes in January 1941, effectively ending their co-operation. In March, the Japanese 11th army attacked the headquarters of the Chinese 19th army but was repulsed during Battle of Shanggao. In September, Japan attempted to take the city of Changsha again and clashed with Chinese nationalist forces.

German successes in Europe encouraged Japan to increase pressure on European governments in Southeast Asia. The Dutch government agreed to provide Japan with some oil supplies from the Dutch East Indies, but negotiations for additional access to their resources ended in failure in June 1941. In July 1941 Japan sent troops to southern Indochina, thus threatening British and Dutch possessions in the Far East. The United States, the United Kingdom, and other Western governments reacted to this move with a freeze on Japanese assets and a total oil embargo. At the same time, Japan was planning an invasion of the Soviet Far East, intending to capitalise off the German invasion in the west, but abandoned the operation after the sanctions.

Since early 1941 the United States and Japan had been engaged in negotiations in an attempt to improve their strained relations and end the war in China. During these negotiations, Japan advanced a number of proposals which were dismissed by the Americans as inadequate. At the same time the United States, the United Kingdom, and the Netherlands engaged in secret discussions for the joint defence of their territories, in the event of a Japanese attack against any of them. Roosevelt reinforced the Philippines (an American protectorate scheduled for independence in 1946) and warned Japan that the United States would react to Japanese attacks against any "neighboring countries".

The USS Arizona was a total loss in the Japanese surprise air attack on the American Pacific Fleet at Pearl Harbor, Sunday 7 December 1941.

Frustrated at the lack of progress and feeling the pinch of the American–British–Dutch sanctions, Japan prepared for war. On 20 November, a new government under Hideki Tojo presented an interim proposal as its final offer. It called for the end of American aid to China and for lifting the embargo on the supply of oil and other resources to Japan. In exchange, Japan promised not to launch any attacks in Southeast Asia and to withdraw its forces from southern Indochina. The American counter-proposal of 26 November required that Japan evacuate all of China without conditions and conclude non-aggression pacts with all Pacific powers. That meant Japan was essentially forced to choose between abandoning its ambitions in China, or seizing the natural resources it needed in the Dutch East Indies by force; the Japanese military did not consider the former an option, and many officers considered the oil embargo an unspoken declaration of war.

Japan planned to rapidly seize European colonies in Asia to create a large defensive perimeter stretching into the Central Pacific. The Japanese would then be free to exploit the resources of Southeast Asia while exhausting the over-stretched Allies by fighting a defensive war. To prevent American intervention while securing the perimeter, it was further planned to neutralise the United States Pacific Fleet and the American military presence in the Philippines from the outset. On 7 December 1941 (8 December in Asian time zones), Japan attacked British and American holdings with near-simultaneous offensives against Southeast Asia and the Central Pacific. These included an attack on the American fleets at Pearl Harbor and the Philippines, Guam, Wake Island, landings in Malaya, Thailand and the Battle of Hong Kong.

The Japanese invasion of Thailand led to Thailand's decision to ally itself with Japan and the other Japanese attacks led the United States, United Kingdom, China, Australia, and several other states to formally declare war on Japan, whereas the Soviet Union, being heavily involved in large-scale hostilities with European Axis countries, maintained its neutrality agreement with Japan. Germany, followed by the other Axis states, declared war on the United States in solidarity with Japan, citing as justification the American attacks on German war vessels that had been ordered by Roosevelt.

Axis advance stalls (1942–43)

US President Franklin D. Roosevelt and British PM Winston Churchill seated at the Casablanca Conference, January 1943

On 1 January 1942, the Allied Big Four—the Soviet Union, China, the United Kingdom and the United States—and 22 smaller or exiled governments issued the Declaration by United Nations, thereby affirming the Atlantic Charter, and agreeing not to sign a separate peace with the Axis powers.

During 1942, Allied officials debated on the appropriate grand strategy to pursue. All agreed that defeating Germany was the primary objective. The Americans favoured a straightforward, large-scale attack on Germany through France. The Soviets were also demanding a second front. The British, on the other hand, argued that military operations should target peripheral areas to wear out German strength, leading to increasing demoralisation, and bolster resistance forces. Germany itself would be subject to a heavy bombing campaign. An offensive against Germany would then be launched primarily by Allied armour without using large-scale armies. Eventually, the British persuaded the Americans that a landing in France was infeasible in 1942 and they should instead focus on driving the Axis out of North Africa.

At the Casablanca Conference in early 1943, the Allies reiterated the statements issued in the 1942 Declaration and demanded the unconditional surrender of their enemies. The British and Americans agreed to continue to press the initiative in the Mediterranean by invading Sicily to fully secure the Mediterranean supply routes. Although the British argued for further operations in the Balkans to bring Turkey into the war, in May 1943, the Americans extracted a British commitment to limit Allied operations in the Mediterranean to an invasion of the Italian mainland and to invade France in 1944.

Pacific (1942–43)

Map of Japanese military advances through mid-1942

By the end of April 1942, Japan and its ally Thailand had almost fully conquered Burma, Malaya, the Dutch East Indies, Singapore, and Rabaul, inflicting severe losses on Allied troops and taking a large number of prisoners. Despite stubborn resistance by Filipino and US forces, the Philippine Commonwealth was eventually captured in May 1942, forcing its government into exile. On 16 April, in Burma, 7,000 British soldiers were encircled by the Japanese 33rd Division during the Battle of Yenangyaung and rescued by the Chinese 38th Division. Japanese forces also achieved naval victories in the South China Sea, Java Sea and Indian Ocean, and bombed the Allied naval base at Darwin, Australia. In January 1942, the only Allied success against Japan was a Chinese victory at Changsha. These easy victories over the unprepared US and European opponents left Japan overconfident, as well as overextended.

In early May 1942, Japan initiated operations to capture Port Moresby by amphibious assault and thus sever communications and supply lines between the United States and Australia. The planned invasion was thwarted when an Allied task force, centred on two American fleet carriers, fought Japanese naval forces to a draw in the Battle of the Coral Sea. Japan's next plan, motivated by the earlier Doolittle Raid, was to seize Midway Atoll and lure American carriers into battle to be eliminated; as a diversion, Japan would also send forces to occupy the Aleutian Islands in Alaska. In mid-May, Japan started the Zhejiang-Jiangxi campaign in China, with the goal of inflicting retribution on the Chinese who aided the surviving American airmen in the Doolittle Raid by destroying Chinese air bases and fighting against the Chinese 23rd and 32nd Army Groups. In early June, Japan put its operations into action, but the Americans, having broken Japanese naval codes in late May, were fully aware of the plans and order of battle, and used this knowledge to achieve a decisive victory at Midway over the Imperial Japanese Navy.

With its capacity for aggressive action greatly diminished as a result of the Midway battle, Japan chose to focus on a belated attempt to capture Port Moresby by an overland campaign in the Territory of Papua. The Americans planned a counter-attack against Japanese positions in the southern Solomon Islands, primarily Guadalcanal, as a first step towards capturing Rabaul, the main Japanese base in Southeast Asia.

Both plans started in July, but by mid-September, the Battle for Guadalcanal took priority for the Japanese, and troops in New Guinea were ordered to withdraw from the Port Moresby area to the northern part of the island, where they faced Australian and United States troops in the Battle of Buna–Gona. Guadalcanal soon became a focal point for both sides with heavy commitments of troops and ships in the battle for Guadalcanal. By the start of 1943, the Japanese were defeated on the island and withdrew their troops. In Burma, Commonwealth forces mounted two operations. The first, an offensive into the Arakan region in late 1942, went disastrously, forcing a retreat back to India by May 1943. The second was the insertion of irregular forces behind Japanese front-lines in February which, by the end of April, had achieved mixed results.

Eastern Front (1942–43)

Red Army soldiers on the counterattack during the Battle of Stalingrad, February 1943

Despite considerable losses, in early 1942 Germany and its allies stopped a major Soviet offensive in central and southern Russia, keeping most territorial gains they had achieved during the previous year. In May the Germans defeated Soviet offensives in the Kerch Peninsula and at Kharkov, and then launched their main summer offensive against southern Russia in June 1942, to seize the oil fields of the Caucasus and occupy the Kuban steppe, while maintaining positions on the northern and central areas of the front. The Germans split Army Group South into two groups: Army Group A advanced to the lower Don River and struck south-east to the Caucasus, while Army Group B headed towards the Volga River. The Soviets decided to make their stand at Stalingrad on the Volga.

By mid-November, the Germans had nearly taken Stalingrad in bitter street fighting. The Soviets began their second winter counter-offensive, starting with an encirclement of German forces at Stalingrad, and an assault on the Rzhev salient near Moscow, though the latter failed disastrously. By early February 1943, the German Army had taken tremendous losses; German troops at Stalingrad had been defeated, and the front-line had been pushed back beyond its position before the summer offensive. In mid-February, after the Soviet push had tapered off, the Germans launched another attack on Kharkov, creating a salient in their front line around the Soviet city of Kursk.

Western Europe/Atlantic and Mediterranean (1942–43)

American 8th Air Force Boeing B-17 Flying Fortress bombing raid on the Focke-Wulf factory in Germany, 9 October 1943

Exploiting poor American naval command decisions, the German navy ravaged Allied shipping off the American Atlantic coast. By November 1941, Commonwealth forces had launched a counter-offensive, Operation Crusader, in North Africa, and reclaimed all the gains the Germans and Italians had made. In North Africa, the Germans launched an offensive in January, pushing the British back to positions at the Gazala line by early February, followed by a temporary lull in combat which Germany used to prepare for their upcoming offensives. Concerns the Japanese might use bases in Vichy-held Madagascar caused the British to invade the island in early May 1942. An Axis offensive in Libya forced an Allied retreat deep inside Egypt until Axis forces were stopped at El Alamein. On the Continent, raids of Allied commandos on strategic targets, culminating in the disastrous Dieppe Raid, demonstrated the Western Allies' inability to launch an invasion of continental Europe without much better preparation, equipment, and operational security.[page needed]

In August 1942, the Allies succeeded in repelling a second attack against El Alamein and, at a high cost, managed to deliver desperately needed supplies to the besieged Malta. A few months later, the Allies commenced an attack of their own in Egypt, dislodging the Axis forces and beginning a drive west across Libya. This attack was followed up shortly after by Anglo-American landings in French North Africa, which resulted in the region joining the Allies. Hitler responded to the French colony's defection by ordering the occupation of Vichy France; although Vichy forces did not resist this violation of the armistice, they managed to scuttle their fleet to prevent its capture by German forces. The Axis forces in Africa withdrew into Tunisia, which was conquered by the Allies in May 1943.

In June 1943 the British and Americans began a strategic bombing campaign against Germany with a goal to disrupt the war economy, reduce morale, and "de-house" the civilian population. The firebombing of Hamburg was among the first attacks in this campaign, inflicting significant casualties and considerable losses on infrastructure of this important industrial centre.

Allies gain momentum (1943–44)

After the Guadalcanal Campaign, the Allies initiated several operations against Japan in the Pacific. In May 1943, Canadian and US forces were sent to eliminate Japanese forces from the Aleutians. Soon after, the United States, with support from Australia, New Zealand and Pacific Islander forces, began major ground, sea and air operations to isolate Rabaul by capturing surrounding islands, and breach the Japanese Central Pacific perimeter at the Gilbert and Marshall Islands. By the end of March 1944, the Allies had completed both of these objectives and had also neutralised the major Japanese base at Truk in the Caroline Islands. In April, the Allies launched an operation to retake Western New Guinea.

In the Soviet Union, both the Germans and the Soviets spent the spring and early summer of 1943 preparing for large offensives in central Russia. On 4 July 1943, Germany attacked Soviet forces around the Kursk Bulge. Within a week, German forces had exhausted themselves against the Soviets' deeply echeloned and well-constructed defences, and for the first time in the war Hitler cancelled the operation before it had achieved tactical or operational success. This decision was partially affected by the Western Allies' invasion of Sicily launched on 9 July, which, combined with previous Italian failures, resulted in the ousting and arrest of Mussolini later that month.

Red Army troops in a counter-offensive on German positions at the Battle of Kursk, July 1943

On 12 July 1943, the Soviets launched their own counter-offensives, thereby dispelling any chance of German victory or even stalemate in the east. The Soviet victory at Kursk marked the end of German superiority, giving the Soviet Union the initiative on the Eastern Front. The Germans tried to stabilise their eastern front along the hastily fortified Panther–Wotan line, but the Soviets broke through it at Smolensk and by the Lower Dnieper Offensive.

On 3 September 1943, the Western Allies invaded the Italian mainland, following Italy's armistice with the Allies. Germany with the help of fascists responded by disarming Italian forces that were in many places without superior orders, seizing military control of Italian areas, and creating a series of defensive lines. German special forces then rescued Mussolini, who then soon established a new client state in German-occupied Italy named the Italian Social Republic, causing an Italian civil war. The Western Allies fought through several lines until reaching the main German defensive line in mid-November.

German operations in the Atlantic also suffered. By May 1943, as Allied counter-measures became increasingly effective, the resulting sizeable German submarine losses forced a temporary halt of the German Atlantic naval campaign. In November 1943, Franklin D. Roosevelt and Winston Churchill met with Chiang Kai-shek in Cairo and then with Joseph Stalin in Tehran. The former conference determined the post-war return of Japanese territory and the military planning for the Burma campaign, while the latter included agreement that the Western Allies would invade Europe in 1944 and that the Soviet Union would declare war on Japan within three months of Germany's defeat.

Ruins of the Benedictine monastery, during the Battle of Monte Cassino, Italian Campaign, May 1944

From November 1943, during the seven-week Battle of Changde, the Chinese forced Japan to fight a costly war of attrition, while awaiting Allied relief. In January 1944, the Allies launched a series of attacks in Italy against the line at Monte Cassino and tried to outflank it with landings at Anzio.

On 27 January 1944, Soviet troops launched a major offensive that expelled German forces from the Leningrad region, thereby ending the most lethal siege in history. The following Soviet offensive was halted on the pre-war Estonian border by the German Army Group North aided by Estonians hoping to re-establish national independence. This delay slowed subsequent Soviet operations in the Baltic Sea region. By late May 1944, the Soviets had liberated Crimea, largely expelled Axis forces from Ukraine, and made incursions into Romania, which were repulsed by the Axis troops. The Allied offensives in Italy had succeeded and, at the expense of allowing several German divisions to retreat, on 4 June Rome was captured.

The Allies had mixed success in mainland Asia. In March 1944, the Japanese launched the first of two invasions, an operation against British positions in Assam, India, and soon besieged Commonwealth positions at Imphal and Kohima. In May 1944, British forces mounted a counter-offensive that drove Japanese troops back to Burma by July, and Chinese forces that had invaded northern Burma in late 1943 besieged Japanese troops in Myitkyina. The second Japanese invasion of China aimed to destroy China's main fighting forces, secure railways between Japanese-held territory and capture Allied airfields. By June, the Japanese had conquered the province of Henan and begun a new attack on Changsha.

Allies close in (1944)

American troops approaching Omaha Beach during the invasion of Normandy on D-Day, 6 June 1944

On 6 June 1944 (known as D-Day), after three years of Soviet pressure, the Western Allies invaded northern France. After reassigning several Allied divisions from Italy, they also attacked southern France. These landings were successful and led to the defeat of the German Army units in France. Paris was liberated on 25 August by the local resistance assisted by the Free French Forces, both led by General Charles de Gaulle, and the Western Allies continued to push back German forces in western Europe during the latter part of the year. An attempt to advance into northern Germany spearheaded by a major airborne operation in the Netherlands failed. After that, the Western Allies slowly pushed into Germany, but failed to cross the Rur river in a large offensive. In Italy, Allied advance also slowed due to the last major German defensive line.

German SS soldiers from the Dirlewanger Brigade, tasked with suppressing the Warsaw Uprising against Nazi occupation, August 1944

On 22 June, the Soviets launched a strategic offensive in Belarus ("Operation Bagration") that almost completely destroyed the German Army Group Centre. Soon after that, another Soviet strategic offensive forced German troops from Western Ukraine and Eastern Poland. The Soviets formed the Polish Committee of National Liberation to control territory in Poland and combat the Polish Armia Krajowa; The Soviet Red Army remained in the Praga district on the other side of the Vistula and watched passively as the Germans quelled the Warsaw Uprising initiated by the Armia Krajowa. The national uprising in Slovakia was also quelled by the Germans. The Soviet Red Army's strategic offensive in eastern Romania cut off and destroyed the considerable German troops there and triggered a successful coup d'état in Romania and in Bulgaria, followed by those countries' shift to the Allied side.

In September 1944, Soviet troops advanced into Yugoslavia and forced the rapid withdrawal of German Army Groups E and F in Greece, Albania and Yugoslavia to rescue them from being cut off. By this point, the Communist-led Partisans under Marshal Josip Broz Tito, who had led an increasingly successful guerrilla campaign against the occupation since 1941, controlled much of the territory of Yugoslavia and engaged in delaying efforts against German forces further south. In northern Serbia, the Soviet Red Army, with limited support from Bulgarian forces, assisted the Partisans in a joint liberation of the capital city of Belgrade on 20 October. A few days later, the Soviets launched a massive assault against German-occupied Hungary that lasted until the fall of Budapest in February 1945. Unlike impressive Soviet victories in the Balkans, bitter Finnish resistance to the Soviet offensive in the Karelian Isthmus denied the Soviets occupation of Finland and led to a Soviet-Finnish armistice on relatively mild conditions, although Finland was forced to fight their former ally Germany.

General Douglas MacArthur returns to the Philippines during the Battle of Leyte, 20 October 1944

By the start of July 1944, Commonwealth forces in Southeast Asia had repelled the Japanese sieges in Assam, pushing the Japanese back to the Chindwin River while the Chinese captured Myitkyina. In September 1944, Chinese forces captured Mount Song and reopened the Burma Road. In China, the Japanese had more successes, having finally captured Changsha in mid-June and the city of Hengyang by early August. Soon after, they invaded the province of Guangxi, winning major engagements against Chinese forces at Guilin and Liuzhou by the end of November and successfully linking up their forces in China and Indochina by mid-December.

In the Pacific, US forces continued to press back the Japanese perimeter. In mid-June 1944, they began their offensive against the Mariana and Palau islands and decisively defeated Japanese forces in the Battle of the Philippine Sea. These defeats led to the resignation of the Japanese Prime Minister, Hideki Tojo, and provided the United States with air bases to launch intensive heavy bomber attacks on the Japanese home islands. In late October, American forces invaded the Filipino island of Leyte; soon after, Allied naval forces scored another large victory in the Battle of Leyte Gulf, one of the largest naval battles in history.

Axis collapse, Allied victory (1944–45)

On 16 December 1944, Germany made a last attempt on the Western Front by using most of its remaining reserves to launch a massive counter-offensive in the Ardennes and along with the French-German border to split the Western Allies, encircle large portions of Western Allied troops and capture their primary supply port at Antwerp to prompt a political settlement. By January, the offensive had been repulsed with no strategic objectives fulfilled. In Italy, the Western Allies remained stalemated at the German defensive line. In mid-January 1945, the Soviets and Poles attacked in Poland, pushing from the Vistula to the Oder river in Germany, and overran East Prussia. On 4 February Soviet, British, and US leaders met for the Yalta Conference. They agreed on the occupation of post-war Germany, and on when the Soviet Union would join the war against Japan.

In February, the Soviets entered Silesia and Pomerania, while Western Allies entered western Germany and closed to the Rhine river. By March, the Western Allies crossed the Rhine north and south of the Ruhr, encircling the German Army Group B. In early March, in an attempt to protect its last oil reserves in Hungary and to retake Budapest, Germany launched its last major offensive against Soviet troops near Lake Balaton. In two weeks, the offensive had been repulsed, the Soviets advanced to Vienna, and captured the city. In early April, Soviet troops captured Königsberg, while the Western Allies finally pushed forward in Italy and swept across western Germany capturing Hamburg and Nuremberg. American and Soviet forces met at the Elbe river on 25 April, leaving several unoccupied pockets in southern Germany and around Berlin.

The German Reichstag after its capture by the Allied forces, 3 June 1945.

Soviet and Polish forces stormed and captured Berlin in late April. In Italy, German forces surrendered on 29 April. On 30 April, the Reichstag was captured, signalling the military defeat of Nazi Germany, Berlin garrison surrendered on 2 May.

Several changes in leadership occurred during this period. On 12 April, President Roosevelt died and was succeeded by Harry S. Truman. Benito Mussolini was killed by Italian partisans on 28 April. Two days later, Hitler committed suicide in besieged Berlin, and he was succeeded by Grand Admiral Karl Dönitz.Total and unconditional surrender in Europe was signed on 7and 8May, to be effective by the end of 8 May. German Army Group Centre resisted in Prague until 11 May.

In the Pacific theatre, American forces accompanied by the forces of the Philippine Commonwealth advanced in the Philippines, clearing Leyte by the end of April 1945. They landed on Luzon in January 1945 and recaptured Manila in March. Fighting continued on Luzon, Mindanao, and other islands of the Philippines until the end of the war. Meanwhile, the United States Army Air Forces launched a massive firebombing campaign of strategic cities in Japan in an effort to destroy Japanese war industry and civilian morale. A devastating bombing raid on Tokyo of 9–10 March was the deadliest conventional bombing raid in history.

Atomic bombing of Nagasaki on 9 August 1945.

In May 1945, Australian troops landed in Borneo, overrunning the oilfields there. British, American, and Chinese forces defeated the Japanese in northern Burma in March, and the British pushed on to reach Rangoon by 3 May. Chinese forces started a counterattack in the Battle of West Hunan that occurred between 6 April and 7 June 1945. American naval and amphibious forces also moved towards Japan, taking Iwo Jima by March, and Okinawa by the end of June. At the same time, American submarines cut off Japanese imports, drastically reducing Japan's ability to supply its overseas forces.

On 11 July, Allied leaders met in Potsdam, Germany. They confirmed earlier agreements about Germany, and the American, British and Chinese governments reiterated the demand for unconditional surrender of Japan, specifically stating that "the alternative for Japan is prompt and utter destruction". During this conference, the United Kingdom held its general election, and Clement Attlee replaced Churchill as Prime Minister.

The call for unconditional surrender was rejected by the Japanese government, which believed it would be capable of negotiating for more favourable surrender terms. In early August, the United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki. Between the two bombings, the Soviets, pursuant to the Yalta agreement, invaded Japanese-held Manchuria and quickly defeated the Kwantung Army, which was the largest Japanese fighting force. These two events persuaded previously adamant Imperial Army leaders to accept surrender terms. The Red Army also captured the southern part of Sakhalin Island and the Kuril Islands. On 15 August 1945, Japan surrendered, with the surrender documents finally signed at Tokyo Bay on the deck of the American battleship USS Missouri on 2 September 1945, ending the war.

Ruins of Warsaw in January 1945, after the deliberate destruction of the city by the occupying German forces

The Allies established occupation administrations in Austria and Germany. The former became a neutral state, non-aligned with any political bloc. The latter was divided into western and eastern occupation zones controlled by the Western Allies and the Soviet Union. A denazification programme in Germany led to the prosecution of Nazi war criminals in the Nuremberg trials and the removal of ex-Nazis from power, although this policy moved towards amnesty and re-integration of ex-Nazis into West German society.

Germany lost a quarter of its pre-war (1937) territory. Among the eastern territories, Silesia, Neumark and most of Pomerania were taken over by Poland, and East Prussia was divided between Poland and the Soviet Union, followed by the expulsion to Germany of the nine million Germans from these provinces, as well as three million Germans from the Sudetenland in Czechoslovakia. By the 1950s, one-fifth of West Germans were refugees from the east. The Soviet Union also took over the Polish provinces east of the Curzon line, from which 2 million Poles were expelled; north-east Romania, parts of eastern Finland, and the three Baltic states were incorporated into the Soviet Union.

Defendants at the Nuremberg trials, where the Allied forces prosecuted prominent members of the political, military, judicial and economic leadership of Nazi Germany for crimes against humanity

In an effort to maintain world peace, the Allies formed the United Nations, which officially came into existence on 24 October 1945, and adopted the Universal Declaration of Human Rights in 1948 as a common standard for all member nations. The great powers that were the victors of the war—France, China, the United Kingdom, the Soviet Union and the United States—became the permanent members of the UN's Security Council. The five permanent members remain so to the present, although there have been two seat changes, between the Republic of China and the People's Republic of China in 1971, and between the Soviet Union and its successor state, the Russian Federation, following the dissolution of the Soviet Union in 1991. The alliance between the Western Allies and the Soviet Union had begun to deteriorate even before the war was over.

Post-war border changes in Central Europe and creation of the Communist Eastern Bloc

Germany had been de facto divided, and two independent states, the Federal Republic of Germany (West Germany) and the German Democratic Republic (East Germany), were created within the borders of Allied and Soviet occupation zones. The rest of Europe was also divided into Western and Soviet spheres of influence. Most eastern and central European countries fell into the Soviet sphere, which led to establishment of Communist-led regimes, with full or partial support of the Soviet occupation authorities. As a result, East Germany, Poland, Hungary, Romania, Czechoslovakia, and Albania became Soviet satellite states. Communist Yugoslavia conducted a fully independent policy, causing tension with the Soviet Union.

Post-war division of the world was formalised by two international military alliances, the United States-led NATO and the Soviet-led Warsaw Pact. The long period of political tensions and military competition between them, the Cold War, would be accompanied by an unprecedented arms race and number of proxy wars throughout the world.

In Asia, the United States led the occupation of Japan and administered Japan's former islands in the Western Pacific, while the Soviets annexed South Sakhalin and the Kuril Islands. Korea, formerly under Japanese rule, was divided and occupied by the Soviet Union in the North and the United States in the South between 1945 and 1948. Separate republics emerged on both sides of the 38th parallel in 1948, each claiming to be the legitimate government for all of Korea, which led ultimately to the Korean War.

In China, nationalist and communist forces resumed the civil war in June 1946. Communist forces were victorious and established the People's Republic of China on the mainland, while nationalist forces retreated to Taiwan in 1949. In the Middle East, the Arab rejection of the United Nations Partition Plan for Palestine and the creation of Israel marked the escalation of the Arab–Israeli conflict. While European powers attempted to retain some or all of their colonial empires, their losses of prestige and resources during the war rendered this unsuccessful, leading to decolonisation.

The global economy suffered heavily from the war, although participating nations were affected differently. The United States emerged much richer than any other nation, leading to a baby boom, and by 1950 its gross domestic product per person was much higher than that of any of the other powers, and it dominated the world economy. The UK and US pursued a policy of industrial disarmament in Western Germany in the years 1945–1948. Because of international trade interdependencies this led to European economic stagnation and delayed European recovery for several years.

Recovery began with the mid-1948 currency reform in Western Germany, and was sped up by the liberalisation of European economic policy that the Marshall Plan (1948–1951) both directly and indirectly caused. The post-1948 West German recovery has been called the German economic miracle. Italy also experienced an economic boom and the French economy rebounded. By contrast, the United Kingdom was in a state of economic ruin, and although receiving a quarter of the total Marshall Plan assistance, more than any other European country, it continued in relative economic decline for decades.

The Soviet Union, despite enormous human and material losses, also experienced rapid increase in production in the immediate post-war era. Japan recovered much later. China returned to its pre-war industrial production by 1952.

Casualties and war crimes

World War II deaths

Estimates for the total number of casualties in the war vary, because many deaths went unrecorded. Most suggest that some 60 million people died in the war, including about 20 million military personnel and 40 million civilians. Many of the civilians died because of deliberate genocide, massacres, mass bombings, disease, and starvation.

The Soviet Union alone lost around 27 million people during the war, including 8.7 million military and 19 million civilian deaths. A quarter of the total people in the Soviet Union were wounded or killed. Germany sustained 5.3 million military losses, mostly on the Eastern Front and during the final battles in Germany.

An estimated 11 to 17 million civilians died as a direct or as an indirect result of Hitler's racist policies, including mass killing of around 6million Jews, along with Roma, homosexuals, at least 1.9 million ethnic Poles and millions of other Slavs (including Russians, Ukrainians and Belarusians), and other ethnic and minority groups. Between 1941 and 1945, more than 200,000 ethnic Serbs, along with gypsies and Jews, were persecuted and murdered by the Axis-aligned Croatian Ustaše in Yugoslavia. Concurrently, Muslims and Croats were persecuted and killed by Serb nationalist Chetniks, with an estimated 50,000-68,000 victims (of which 41,000 were civilians). Also, more than 100,000 Poles were massacred by the Ukrainian Insurgent Army in the Volhynia massacres, between 1943 and 1945. At the same time, about 10,000–15,000 Ukrainians were killed by the Polish Home Army and other Polish units, in reprisal attacks.

Chinese civilians being buried alive by soldiers of the Imperial Japanese Army, during the Nanking Massacre, December 1937

In Asia and the Pacific, between 3million and more than 10 million civilians, mostly Chinese (estimated at 7.5 million), were killed by the Japanese occupation forces. The most infamous Japanese atrocity was the Nanking Massacre, in which fifty to three hundred thousand Chinese civilians were raped and murdered. Mitsuyoshi Himeta reported that 2.7 million casualties occurred during the Sankō Sakusen. General Yasuji Okamura implemented the policy in Heipei and Shantung.

Axis forces employed biological and chemical weapons. The Imperial Japanese Army used a variety of such weapons during its invasion and occupation of China (see Unit 731) and in early conflicts against the Soviets. Both the Germans and the Japanese tested such weapons against civilians, and sometimes on prisoners of war.

The Soviet Union was responsible for the Katyn massacre of 22,000 Polish officers, and the imprisonment or execution of thousands of political prisoners by the NKVD, along with mass civilian deportations to Siberia, in the Baltic states and eastern Poland annexed by the Red Army.

The mass bombing of cities in Europe and Asia has often been called a war crime, although no positive or specific customary international humanitarian law with respect to aerial warfare existed before or during World War II. The USAAF firebombed a total of 67 Japanese cities, killing 393,000 civilians and destroying 65% of built-up areas.

Genocide, concentration camps, and slave labour

Schutzstaffel (SS) female camp guards removing prisoners' bodies from lorries and carrying them to a mass grave, inside the German Bergen-Belsen concentration camp, 1945

Nazi Germany, under the dictatorship of Adolf Hitler, was responsible for the Holocaust (which killed approximately 6million Jews) as well as for killing 2.7 million ethnic Poles and 4million others who were deemed "unworthy of life" (including the disabled and mentally ill, Soviet prisoners of war, Romani, homosexuals, Freemasons, and Jehovah's Witnesses) as part of a programme of deliberate extermination, in effect becoming a "genocidal state". Soviet POWs were kept in especially unbearable conditions, and 3.6 million Soviet POWs out of 5.7 million died in Nazi camps during the war. In addition to concentration camps, death camps were created in Nazi Germany to exterminate people on an industrial scale. Nazi Germany extensively used forced labourers; about 12 million Europeans from German-occupied countries were abducted and used as a slave work force in German industry, agriculture and war economy.

The Soviet Gulag became a de facto system of deadly camps during 1942–43, when wartime privation and hunger caused numerous deaths of inmates, including foreign citizens of Poland and other countries occupied in 1939–40 by the Soviet Union, as well as Axis POWs. By the end of the war, most Soviet POWs liberated from Nazi camps and many repatriated civilians were detained in special filtration camps where they were subjected to NKVD evaluation, and 226,127 were sent to the Gulag as real or perceived Nazi collaborators.

Prisoner identity photograph taken by the German SS of a Polish girl deported to Auschwitz. Approximately 230,000 children were held prisoner and used in forced labour and medical experiments.

Japanese prisoner-of-war camps, many of which were used as labour camps, also had high death rates. The International Military Tribunal for the Far East found the death rate of Western prisoners was 27 per cent (for American POWs, 37 per cent), seven times that of POWs under the Germans and Italians. While 37,583 prisoners from the UK, 28,500 from the Netherlands, and 14,473 from the United States were released after the surrender of Japan, the number of Chinese released was only 56.

At least five million Chinese civilians from northern China and Manchukuo were enslaved between 1935 and 1941 by the East Asia Development Board, or Kōain, for work in mines and war industries. After 1942, the number reached 10 million. In Java, between 4and 10 million rōmusha (Japanese: "manual labourers"), were forced to work by the Japanese military. About 270,000 of these Javanese labourers were sent to other Japanese-held areas in South East Asia, and only 52,000 were repatriated to Java.

Occupation

Polish civilians wearing blindfolds photographed just before their execution by German soldiers in Palmiry forest, 1940

In Europe, occupation came under two forms. In Western, Northern, and Central Europe (France, Norway, Denmark, the Low Countries, and the annexed portions of Czechoslovakia) Germany established economic policies through which it collected roughly 69.5 billion reichsmarks (27.8 billion US dollars) by the end of the war; this figure does not include the sizeable plunder of industrial products, military equipment, raw materials and other goods. Thus, the income from occupied nations was over 40 percent of the income Germany collected from taxation, a figure which increased to nearly 40 percent of total German income as the war went on.

Soviet partisans hanged by the German army. The Russian Academy of Sciences reported in 1995 civilian victims in the Soviet Union at German hands totalled 13.7 million dead, twenty percent of the 68 million persons in the occupied Soviet Union.

In the East, the intended gains of Lebensraum were never attained as fluctuating front-lines and Soviet scorched earth policies denied resources to the German invaders. Unlike in the West, the Nazi racial policy encouraged extreme brutality against what it considered to be the "inferior people" of Slavic descent; most German advances were thus followed by mass executions. Although resistance groups formed in most occupied territories, they did not significantly hamper German operations in either the East or the West until late 1943.

In Asia, Japan termed nations under its occupation as being part of the Greater East Asia Co-Prosperity Sphere, essentially a Japanese hegemony which it claimed was for purposes of liberating colonised peoples. Although Japanese forces were sometimes welcomed as liberators from European domination, Japanese war crimes frequently turned local public opinion against them. During Japan's initial conquest, it captured 4,000,000 barrels (640,000 m3) of oil (~5.5×105 tonnes) left behind by retreating Allied forces; and by 1943, was able to get production in the Dutch East Indies up to 50 million barrels (~6.8×10^6 t), 76 per cent of its 1940 output rate.

Home fronts and production

Allies to Axis GDP ratio between 1938 and 1945

In Europe, before the outbreak of the war, the Allies had significant advantages in both population and economics. In 1938, the Western Allies (United Kingdom, France, Poland and the British Dominions) had a 30 percent larger population and a 30 percent higher gross domestic product than the European Axis powers (Germany and Italy); if colonies are included, the Allies had more than a 5:1 advantage in population and a nearly 2:1 advantage in GDP. In Asia at the same time, China had roughly six times the population of Japan but only an 89 percent higher GDP; this is reduced to three times the population and only a 38 percent higher GDP if Japanese colonies are included.

The United States produced about two-thirds of all the munitions used by the Allies in WWII, including warships, transports, warplanes, artillery, tanks, trucks, and ammunition. Though the Allies' economic and population advantages were largely mitigated during the initial rapid blitzkrieg attacks of Germany and Japan, they became the decisive factor by 1942, after the United States and Soviet Union joined the Allies, as the war largely settled into one of attrition. While the Allies' ability to out-produce the Axis is often attributed[by whom?] to the Allies having more access to natural resources, other factors, such as Germany and Japan's reluctance to employ women in the labour force, Allied strategic bombing, and Germany's late shift to a war economy contributed significantly. Additionally, neither Germany nor Japan planned to fight a protracted war, and had not equipped themselves to do so. To improve their production, Germany and Japan used millions of slave labourers; Germany used about 12 million people, mostly from Eastern Europe, while Japan used more than 18 million people in Far East Asia.

Advances in technology and warfare

Aircraft were used for reconnaissance, as fighters, bombers, and ground-support, and each role was advanced considerably. Innovation included airlift (the capability to quickly move limited high-priority supplies, equipment, and personnel); and of strategic bombing (the bombing of enemy industrial and population centres to destroy the enemy's ability to wage war). Anti-aircraft weaponry also advanced, including defences such as radar and surface-to-air artillery. The use of the jet aircraft was pioneered and, though late introduction meant it had little impact, it led to jets becoming standard in air forces worldwide. Although guided missiles were being developed, they were not advanced enough to reliably target aircraft until some years after the war.

Advances were made in nearly every aspect of naval warfare, most notably with aircraft carriers and submarines. Although aeronautical warfare had relatively little success at the start of the war, actions at Taranto, Pearl Harbor, and the Coral Sea established the carrier as the dominant capital ship in place of the battleship. In the Atlantic, escort carriers proved to be a vital part of Allied convoys, increasing the effective protection radius and helping to close the Mid-Atlantic gap. Carriers were also more economical than battleships because of the relatively low cost of aircraft and their not requiring to be as heavily armoured. Submarines, which had proved to be an effective weapon during the First World War, were anticipated by all sides to be important in the second. The British focused development on anti-submarine weaponry and tactics, such as sonar and convoys, while Germany focused on improving its offensive capability, with designs such as the Type VII submarine and wolfpack tactics.[better source needed] Gradually, improving Allied technologies such as the Leigh light, hedgehog, squid, and homing torpedoes proved victorious over the German submarines.

A V-2 rocket launched from a fixed site in Peenemünde, 21 June 1943

Land warfare changed from the static front lines of trench warfare of World War I, which had relied on improved artillery that outmatched the speed of both infantry and cavalry, to increased mobility and combined arms. The tank, which had been used predominantly for infantry support in the First World War, had evolved into the primary weapon. In the late 1930s, tank design was considerably more advanced than it had been during World WarI, and advances continued throughout the war with increases in speed, armour and firepower.[citation needed] At the start of the war, most commanders thought enemy tanks should be met by tanks with superior specifications. This idea was challenged by the poor performance of the relatively light early tank guns against armour, and German doctrine of avoiding tank-versus-tank combat. This, along with Germany's use of combined arms, were among the key elements of their highly successful blitzkrieg tactics across Poland and France. Many means of destroying tanks, including indirect artillery, anti-tank guns (both towed and self-propelled), mines, short-ranged infantry antitank weapons, and other tanks were used. Even with large-scale mechanisation, infantry remained the backbone of all forces, and throughout the war, most infantry were equipped similarly to World War I. The portable machine gun spread, a notable example being the German MG34, and various submachine guns which were suited to close combat in urban and jungle settings. The assault rifle, a late war development incorporating many features of the rifle and submachine gun, became the standard postwar infantry weapon for most armed forces.

Nuclear Gadget being raised to the top of the detonation "shot tower", at Alamogordo Bombing Range; Trinity nuclear test, New Mexico, July 1945

Most major belligerents attempted to solve the problems of complexity and security involved in using large codebooks for cryptography by designing ciphering machines, the most well known being the German Enigma machine. Development of SIGINT (signals intelligence) and cryptanalysis enabled the countering process of decryption. Notable examples were the Allied decryption of Japanese naval codes and British Ultra, a pioneering method for decoding Enigma benefiting from information given to the United Kingdom by the Polish Cipher Bureau, which had been decoding early versions of Enigma before the war. Another aspect of military intelligence was the use of deception, which the Allies used to great effect, such as in operations Mincemeat and Bodyguard.

Other technological and engineering feats achieved during, or as a result of, the war include the world's first programmable computers (Z3, Colossus, and ENIAC), guided missiles and modern rockets, the Manhattan Project's development of nuclear weapons, operations research and the development of artificial harbours and oil pipelines under the English Channel.[citation needed] Penicillin was first mass-produced and used during the war (see Stabilization and mass production of penicillin).

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World War II Language Watch Edit The Second World War and WWII redirect here For other uses see The Second World War disambiguation WWII disambiguation and World War II disambiguation World War II or the Second World War often abbreviated as WWII or WW2 was a global war that lasted from 1939 to 1945 It involved the vast majority of the world s countries including all of the great powers forming two opposing military alliances the Allies and the Axis powers In a total war directly involving more than 100 million personnel from more than 30 countries the major participants threw their entire economic industrial and scientific capabilities behind the war effort blurring the distinction between civilian and military resources Aircraft played a major role in the conflict enabling the strategic bombing of population centres and the only two uses of nuclear weapons in war to this day World War II was by far the deadliest conflict in human history it resulted in 70 to 85 million fatalities a majority being civilians Tens of millions of people died due to genocides including the Holocaust starvation massacres and disease In the wake of the Axis defeat Germany and Japan were occupied and war crimes tribunals were conducted against German and Japanese leaders World War IIClockwise from top left Chinese forces in the Battle of Changde Australian 25 pounder guns during the First Battle of El Alamein German Stuka dive bombers on the Eastern Front in December 1943 US naval force in the Lingayen Gulf Wilhelm Keitel signing the German Instrument of Surrender Soviet troops in the Battle of StalingradDate1 September 1939 2 September 1945 1939 09 01 1945 09 02 a 6 years and 1 day LocationEurope Pacific Atlantic Indian Ocean South East Asia China Japan Middle East Mediterranean North Africa Horn of Africa Central Africa Australia briefly North and South AmericaResultAllied victory Fall of Nazi Germany Fascist Italy and Imperial Japan Allied military occupations of Germany Japan Austria and foundation of the Italian Republic in place of the Kingdom of Italy Beginning of the Nuclear Age Dissolution of the League of Nations and creation of the United Nations Emergence of the United States and the Soviet Union as rival superpowers and beginning of the Cold War See Aftermath of World War II ParticipantsAlliesAxisCommanders and leadersMain Allied leaders Joseph Stalin Franklin D Roosevelt Winston Churchill Chiang Kai shekMain Axis leaders Adolf Hitler Emperor Hirohito Benito MussoliniCasualties and lossesMilitary dead Over 16 000 000 Civilian dead Over 45 000 000 Total dead Over 61 000 000 1937 1945 further detailsMilitary dead Over 8 000 000 Civilian dead Over 4 000 000 Total dead Over 12 000 000 1937 1945 further details World War II is generally considered to have begun on 1 September 1939 when Nazi Germany under Adolf Hitler invaded Poland The United Kingdom and France subsequently declared war on Germany on 3 September Under the Molotov Ribbentrop Pact of August 1939 Germany and the Soviet Union had partitioned Poland and marked out their spheres of influence across Finland Romania and the Baltic states From late 1939 to early 1941 in a series of campaigns and treaties Germany conquered or controlled much of continental Europe and formed the Axis alliance with Italy and Japan along with other countries later on Following the onset of campaigns in North Africa and East Africa and the fall of France in mid 1940 the war continued primarily between the European Axis powers and the British Empire with war in the Balkans the aerial Battle of Britain the Blitz of the UK and the Battle of the Atlantic On 22 June 1941 Germany led the European Axis powers in an invasion of the Soviet Union opening the Eastern Front the largest land theatre of war in history and trapping the Axis powers crucially the German Wehrmacht in a war of attrition Japan which aimed to dominate Asia and the Pacific was at war with the Republic of China by 1937 In December 1941 Japan attacked American and British territories with near simultaneous offensives against Southeast Asia and the Central Pacific including an attack on the US fleet at Pearl Harbor which forced the US to declare war against Japan the European Axis powers declared war on the US in solidarity Japan soon captured much of the western Pacific but its advances were halted in 1942 after losing the critical Battle of Midway later Germany and Italy were defeated in North Africa and at Stalingrad in the Soviet Union Key setbacks in 1943 including a series of German defeats on the Eastern Front the Allied invasions of Sicily and the Italian mainland and Allied offensives in the Pacific cost the Axis powers their initiative and forced it into strategic retreat on all fronts In 1944 the Western Allies invaded German occupied France while the Soviet Union regained its territorial losses and turned towards Germany and its allies During 1944 and 1945 Japan suffered reversals in mainland Asia while the Allies crippled the Japanese Navy and captured key western Pacific islands The war in Europe concluded with the liberation of German occupied territories and the invasion of Germany by the Western Allies and the Soviet Union culminating in the fall of Berlin to Soviet troops Hitler s suicide and the German unconditional surrender on 8 May 1945 Following the Potsdam Declaration by the Allies on 26 July 1945 and the refusal of Japan to surrender on its terms the United States dropped the first atomic bombs on the Japanese cities of Hiroshima on 6 August and Nagasaki on 9 August Faced with an imminent invasion of the Japanese archipelago the possibility of additional atomic bombings and the Soviet entry into the war against Japan and its invasion of Manchuria Japan announced its intention to surrender on 15 August then signed the surrender document on 2 September 1945 cementing total victory in Asia for the Allies World War II changed the political alignment and social structure of the globe The United Nations UN was established to foster international co operation and prevent future conflicts and the victorious great powers China France the Soviet Union the United Kingdom and the United States became the permanent members of its Security Council The Soviet Union and the United States emerged as rival superpowers setting the stage for the nearly half century long Cold War In the wake of European devastation the influence of its great powers waned triggering the decolonisation of Africa and Asia Most countries whose industries had been damaged moved towards economic recovery and expansion Political integration especially in Europe began as an effort to forestall future hostilities end pre war enmities and forge a sense of common identity Contents 1 Start and end dates 2 Background 2 1 Europe 2 2 Asia 3 Pre war events 3 1 Italian invasion of Ethiopia 1935 3 2 Spanish Civil War 1936 1939 3 3 Japanese invasion of China 1937 3 4 Soviet Japanese border conflicts 3 5 European occupations and agreements 4 Course of the war 4 1 War breaks out in Europe 1939 40 4 2 Western Europe 1940 41 4 3 Mediterranean 1940 41 4 4 Axis attack on the Soviet Union 1941 4 5 War breaks out in the Pacific 1941 4 6 Axis advance stalls 1942 43 4 6 1 Pacific 1942 43 4 6 2 Eastern Front 1942 43 4 6 3 Western Europe Atlantic and Mediterranean 1942 43 4 7 Allies gain momentum 1943 44 4 8 Allies close in 1944 4 9 Axis collapse Allied victory 1944 45 5 Aftermath 6 Impact 6 1 Casualties and war crimes 6 2 Genocide concentration camps and slave labour 6 3 Occupation 6 4 Home fronts and production 6 5 Advances in technology and warfare 7 See also 8 Notes 9 Citations 10 References 11 External linksStart and end datesSee also Timeline of World War II It is generally considered that in Europe World War II started on 1 September 1939 1 2 beginning with the German invasion of Poland and the United Kingdom and France s declaration of war on Germany two days later The dates for the beginning of the war in the Pacific include the start of the Second Sino Japanese War on 7 July 1937 3 4 or the earlier Japanese invasion of Manchuria on 19 September 1931 5 6 7 Others follow the British historian A J P Taylor who held that the Sino Japanese War and war in Europe and its colonies occurred simultaneously and the two wars became World War II in 1941 Other starting dates sometimes used for World War II include the Italian invasion of Abyssinia on 3 October 1935 8 The British historian Antony Beevor views the beginning of World War II as the Battles of Khalkhin Gol fought between Japan and the forces of Mongolia and the Soviet Union from May to September 1939 9 Others view the Spanish Civil War as the start or prelude to World War II 10 11 The exact date of the war s end is also not universally agreed upon It was generally accepted at the time that the war ended with the armistice of 14 August 1945 V J Day rather than with the formal surrender of Japan on 2 September 1945 which officially ended the war in Asia A peace treaty between Japan and the Allies was signed in 1951 12 A 1990 treaty regarding Germany s future allowed the reunification of East and West Germany to take place and resolved most post World War II issues 13 No formal peace treaty between Japan and the Soviet Union was ever signed 14 although the state of war between the two countries was terminated by the Soviet Japanese Joint Declaration of 1956 which also restored full diplomatic relations between them 15 BackgroundMain article Causes of World War II Europe World War I had radically altered the political European map with the defeat of the Central Powers including Austria Hungary Germany Bulgaria and the Ottoman Empire and the 1917 Bolshevik seizure of power in Russia which led to the founding of the Soviet Union Meanwhile the victorious Allies of World War I such as France Belgium Italy Romania and Greece gained territory and new nation states were created out of the collapse of Austria Hungary and the Ottoman and Russian Empires The League of Nations assembly held in Geneva Switzerland 1930 To prevent a future world war the League of Nations was created during the 1919 Paris Peace Conference The organisation s primary goals were to prevent armed conflict through collective security military and naval disarmament and settling international disputes through peaceful negotiations and arbitration 16 Despite strong pacifist sentiment after World War I 17 irredentist and revanchist nationalism emerged in several European states in the same period These sentiments were especially marked in Germany because of the significant territorial colonial and financial losses imposed by the Treaty of Versailles Under the treaty Germany lost around 13 percent of its home territory and all its overseas possessions while German annexation of other states was prohibited reparations were imposed and limits were placed on the size and capability of the country s armed forces 18 The German Empire was dissolved in the German Revolution of 1918 1919 and a democratic government later known as the Weimar Republic was created The interwar period saw strife between supporters of the new republic and hardline opponents on both the right and left Italy as an Entente ally had made some post war territorial gains however Italian nationalists were angered that the promises made by the United Kingdom and France to secure Italian entrance into the war were not fulfilled in the peace settlement From 1922 to 1925 the Fascist movement led by Benito Mussolini seized power in Italy with a nationalist totalitarian and class collaborationist agenda that abolished representative democracy repressed socialist left wing and liberal forces and pursued an aggressive expansionist foreign policy aimed at making Italy a world power and promising the creation of a New Roman Empire 19 Adolf Hitler at a German Nazi political rally in Nuremberg August 1933 Adolf Hitler after an unsuccessful attempt to overthrow the German government in 1923 eventually became the Chancellor of Germany in 1933 when Paul Von Hindenburg and the Reichstag appointed him He abolished democracy espousing a radical racially motivated revision of the world order and soon began a massive rearmament campaign 20 Meanwhile France to secure its alliance allowed Italy a free hand in Ethiopia which Italy desired as a colonial possession The situation was aggravated in early 1935 when the Territory of the Saar Basin was legally reunited with Germany and Hitler repudiated the Treaty of Versailles accelerated his rearmament programme and introduced conscription 21 The United Kingdom France and Italy formed the Stresa Front in April 1935 in order to contain Germany a key step towards military globalisation however that June the United Kingdom made an independent naval agreement with Germany easing prior restrictions The Soviet Union concerned by Germany s goals of capturing vast areas of Eastern Europe drafted a treaty of mutual assistance with France Before taking effect though the Franco Soviet pact was required to go through the bureaucracy of the League of Nations which rendered it essentially toothless 22 The United States concerned with events in Europe and Asia passed the Neutrality Act in August of the same year 23 Hitler defied the Versailles and Locarno treaties by remilitarising the Rhineland in March 1936 encountering little opposition due to the policy of appeasement 24 In October 1936 Germany and Italy formed the Rome Berlin Axis A month later Germany and Japan signed the Anti Comintern Pact which Italy joined the following year 25 Asia The Kuomintang KMT party in China launched a unification campaign against regional warlords and nominally unified China in the mid 1920s but was soon embroiled in a civil war against its former Chinese Communist Party allies 26 and new regional warlords In 1931 an increasingly militaristic Empire of Japan which had long sought influence in China 27 as the first step of what its government saw as the country s right to rule Asia staged the Mukden Incident as a pretext to invade Manchuria and establish the puppet state of Manchukuo 28 China appealed to the League of Nations to stop the Japanese invasion of Manchuria Japan withdrew from the League of Nations after being condemned for its incursion into Manchuria The two nations then fought several battles in Shanghai Rehe and Hebei until the Tanggu Truce was signed in 1933 Thereafter Chinese volunteer forces continued the resistance to Japanese aggression in Manchuria and Chahar and Suiyuan 29 After the 1936 Xi an Incident the Kuomintang and communist forces agreed on a ceasefire to present a united front to oppose Japan 30 Pre war eventsItalian invasion of Ethiopia 1935 Benito Mussolini inspecting troops during the Italo Ethiopian War 1935 Main article Second Italo Ethiopian War The Second Italo Ethiopian War was a brief colonial war that began in October 1935 and ended in May 1936 The war began with the invasion of the Ethiopian Empire also known as Abyssinia by the armed forces of the Kingdom of Italy Regno d Italia which was launched from Italian Somaliland and Eritrea 31 The war resulted in the military occupation of Ethiopia and its annexation into the newly created colony of Italian East Africa Africa Orientale Italiana or AOI in addition it exposed the weakness of the League of Nations as a force to preserve peace Both Italy and Ethiopia were member nations but the League did little when the former clearly violated Article X of the League s Covenant 32 The United Kingdom and France supported imposing sanctions on Italy for the invasion but the sanctions were not fully enforced and failed to end the Italian invasion 33 Italy subsequently dropped its objections to Germany s goal of absorbing Austria 34 Spanish Civil War 1936 1939 Main article Spanish Civil War The bombing of Guernica in 1937 during the Spanish Civil War sparked fears abroad in Europe that the next war would be based on bombing of cities with very high civilian casualties When civil war broke out in Spain Hitler and Mussolini lent military support to the Nationalist rebels led by General Francisco Franco Italy supported the Nationalists to a greater extent than the Nazis did altogether Mussolini sent to Spain more than 70 000 ground troops and 6 000 aviation personnel as well as about 720 aircraft 35 The Soviet Union supported the existing government of the Spanish Republic More than 30 000 foreign volunteers known as the International Brigades also fought against the Nationalists Both Germany and the Soviet Union used this proxy war as an opportunity to test in combat their most advanced weapons and tactics The Nationalists won the civil war in April 1939 Franco now dictator remained officially neutral during World War II but generally favoured the Axis 36 His greatest collaboration with Germany was the sending of volunteers to fight on the Eastern Front 37 Japanese invasion of China 1937 Main article Second Sino Japanese War Japanese Imperial Army soldiers during the Battle of Shanghai 1937 In July 1937 Japan captured the former Chinese imperial capital of Peking after instigating the Marco Polo Bridge Incident which culminated in the Japanese campaign to invade all of China 38 The Soviets quickly signed a non aggression pact with China to lend materiel support effectively ending China s prior co operation with Germany From September to November the Japanese attacked Taiyuan engaged the Kuomintang Army around Xinkou 39 and fought Communist forces in Pingxingguan 40 41 Generalissimo Chiang Kai shek deployed his best army to defend Shanghai but after three months of fighting Shanghai fell The Japanese continued to push the Chinese forces back capturing the capital Nanking in December 1937 After the fall of Nanking tens or hundreds of thousands of Chinese civilians and disarmed combatants were murdered by the Japanese 42 43 In March 1938 Nationalist Chinese forces won their first major victory at Taierzhuang but then the city of Xuzhou was taken by the Japanese in May 44 In June 1938 Chinese forces stalled the Japanese advance by flooding the Yellow River this manoeuvre bought time for the Chinese to prepare their defences at Wuhan but the city was taken by October 45 Japanese military victories did not bring about the collapse of Chinese resistance that Japan had hoped to achieve instead the Chinese government relocated inland to Chongqing and continued the war 46 47 Soviet Japanese border conflicts Main article Soviet Japanese border conflicts Red Army artillery unit during the Battle of Lake Khasan 1938 In the mid to late 1930s Japanese forces in Manchukuo had sporadic border clashes with the Soviet Union and Mongolia The Japanese doctrine of Hokushin ron which emphasised Japan s expansion northward was favoured by the Imperial Army during this time With the Japanese defeat at Khalkin Gol in 1939 the ongoing Second Sino Japanese War 48 and ally Nazi Germany pursuing neutrality with the Soviets this policy would prove difficult to maintain Japan and the Soviet Union eventually signed a Neutrality Pact in April 1941 and Japan adopted the doctrine of Nanshin ron promoted by the Navy which took its focus southward eventually leading to its war with the United States and the Western Allies 49 50 European occupations and agreements Chamberlain Daladier Hitler Mussolini and Ciano pictured just before signing the Munich Agreement 29 September 1938 In Europe Germany and Italy were becoming more aggressive In March 1938 Germany annexed Austria again provoking little response from other European powers 51 Encouraged Hitler began pressing German claims on the Sudetenland an area of Czechoslovakia with a predominantly ethnic German population Soon the United Kingdom and France followed the appeasement policy of British Prime Minister Neville Chamberlain and conceded this territory to Germany in the Munich Agreement which was made against the wishes of the Czechoslovak government in exchange for a promise of no further territorial demands 52 Soon afterwards Germany and Italy forced Czechoslovakia to cede additional territory to Hungary and Poland annexed Czechoslovakia s Zaolzie region 53 Although all of Germany s stated demands had been satisfied by the agreement privately Hitler was furious that British interference had prevented him from seizing all of Czechoslovakia in one operation In subsequent speeches Hitler attacked British and Jewish war mongers and in January 1939 secretly ordered a major build up of the German navy to challenge British naval supremacy In March 1939 Germany invaded the remainder of Czechoslovakia and subsequently split it into the German Protectorate of Bohemia and Moravia and a pro German client state the Slovak Republic 54 Hitler also delivered an ultimatum to Lithuania on 20 March 1939 forcing the concession of the Klaipeda Region formerly the German Memelland 55 German Foreign Minister Joachim von Ribbentrop right and the Soviet leader Joseph Stalin after signing the Molotov Ribbentrop Pact 23 August 1939 Greatly alarmed and with Hitler making further demands on the Free City of Danzig the United Kingdom and France guaranteed their support for Polish independence when Italy conquered Albania in April 1939 the same guarantee was extended to the Kingdoms of Romania and Greece 56 Shortly after the Franco British pledge to Poland Germany and Italy formalised their own alliance with the Pact of Steel 57 Hitler accused the United Kingdom and Poland of trying to encircle Germany and renounced the Anglo German Naval Agreement and the German Polish Non Aggression Pact 58 The situation reached a general crisis in late August as German troops continued to mobilise against the Polish border On 23 August when tripartite negotiations about a military alliance between France the United Kingdom and Soviet Union stalled 59 the Soviet Union signed a non aggression pact with Germany 60 This pact had a secret protocol that defined German and Soviet spheres of influence western Poland and Lithuania for Germany eastern Poland Finland Estonia Latvia and Bessarabia for the Soviet Union and raised the question of continuing Polish independence 61 The pact neutralised the possibility of Soviet opposition to a campaign against Poland and assured that Germany would not have to face the prospect of a two front war as it had in World War I Immediately after that Hitler ordered the attack to proceed on 26 August but upon hearing that the United Kingdom had concluded a formal mutual assistance pact with Poland and that Italy would maintain neutrality he decided to delay it 62 In response to British requests for direct negotiations to avoid war Germany made demands on Poland which only served as a pretext to worsen relations 63 On 29 August Hitler demanded that a Polish plenipotentiary immediately travel to Berlin to negotiate the handover of Danzig and to allow a plebiscite in the Polish Corridor in which the German minority would vote on secession 63 The Poles refused to comply with the German demands and on the night of 30 31 August in a stormy meeting with the British ambassador Nevile Henderson Ribbentrop declared that Germany considered its claims rejected 64 Course of the warMain article Timeline of World War II See also Diplomatic history of World War II War breaks out in Europe 1939 40 Main article European theatre of World War II Soldiers of the German Wehrmacht tearing down the border crossing into Poland 1 September 1939 On 1 September 1939 Germany invaded Poland after having staged several false flag border incidents as a pretext to initiate the invasion 65 The first German attack of the war came against the Polish defenses at Westerplatte 66 The United Kingdom responded with an ultimatum to Germany to cease military operations and on 3 September after the ultimatum was ignored Britain and France declared war on Germany 67 followed by Australia New Zealand South Africa and Canada The alliance provided no direct military support to Poland outside of a cautious French probe into the Saarland 68 The Western Allies also began a naval blockade of Germany which aimed to damage the country s economy and the war effort 69 Germany responded by ordering U boat warfare against Allied merchant and warships which would later escalate into the Battle of the Atlantic 70 Soldiers of the Polish Army during the defence of Poland September 1939 On 8 September German troops reached the suburbs of Warsaw The Polish counter offensive to the west halted the German advance for several days but it was outflanked and encircled by the Wehrmacht Remnants of the Polish army broke through to besieged Warsaw On 17 September 1939 after signing a cease fire with Japan the Soviet Union invaded Eastern Poland 71 under a pretext that the Polish state had ostensibly ceased to exist 72 On 27 September the Warsaw garrison surrendered to the Germans and the last large operational unit of the Polish Army surrendered on 6 October Despite the military defeat Poland never surrendered instead it formed the Polish government in exile and a clandestine state apparatus remained in occupied Poland 73 A significant part of Polish military personnel evacuated to Romania and the Baltic countries many of them later fought against the Axis in other theatres of the war 74 Germany annexed the western and occupied the central part of Poland and the Soviet Union annexed its eastern part small shares of Polish territory were transferred to Lithuania and Slovakia On 6 October Hitler made a public peace overture to the United Kingdom and France but said that the future of Poland was to be determined exclusively by Germany and the Soviet Union The proposal was rejected 64 and Hitler ordered an immediate offensive against France 75 which was postponed until the spring of 1940 due to bad weather 76 77 78 Finnish machine gun nest aimed at Soviet Red Army positions during the Winter War February 1940 The Soviet Union forced the Baltic countries Estonia Latvia and Lithuania which were in the Soviet sphere of influence under the Molotov Ribbentrop pact to sign mutual assistance pacts that stipulated stationing Soviet troops in these countries Soon after significant Soviet military contingents were moved there 79 80 81 Finland refused to sign a similar pact and rejected ceding part of its territory to the Soviet Union The Soviet Union invaded Finland in November 1939 82 and the Soviet Union was expelled from the League of Nations 83 Despite overwhelming numerical superiority Soviet military success was modest but the Finno Soviet war ended in March 1940 with fairly significant Finnish concessions 84 In June 1940 the Soviet Union forcibly annexed Estonia Latvia and Lithuania 80 and the Romanian regions of Bessarabia Northern Bukovina and the Hertsa region Meanwhile Nazi Soviet political rapprochement and economic co operation 85 86 gradually stalled 87 88 and both states began preparations for war 89 Western Europe 1940 41 Main article Western Front World War II German advance into Belgium and Northern France 10 May 4 June 1940 swept past the Maginot Line shown in dark red In April 1940 Germany invaded Denmark and Norway to protect shipments of iron ore from Sweden which the Allies were attempting to cut off 90 Denmark capitulated after a few hours and Norway was conquered within two months 91 despite Allied support British discontent over the Norwegian campaign led to the appointment of Winston Churchill as Prime Minister on 10 May 1940 92 On the same day Germany launched an offensive against France To circumvent the strong Maginot Line fortifications on the Franco German border Germany directed its attack at the neutral nations of Belgium the Netherlands and Luxembourg 93 The Germans carried out a flanking manoeuvre through the Ardennes region 94 which was mistakenly perceived by Allies as an impenetrable natural barrier against armoured vehicles 95 96 By successfully implementing new blitzkrieg tactics the Wehrmacht rapidly advanced to the Channel and cut off the Allied forces in Belgium trapping the bulk of the Allied armies in a cauldron on the Franco Belgian border near Lille The United Kingdom was able to evacuate a significant number of Allied troops from the continent by early June although abandoning almost all their equipment 97 On 10 June Italy invaded France declaring war on both France and the United Kingdom 98 The Germans turned south against the weakened French army and Paris fell to them on 14 June Eight days later France signed an armistice with Germany it was divided into German and Italian occupation zones 99 and an unoccupied rump state under the Vichy Regime which though officially neutral was generally aligned with Germany France kept its fleet which the United Kingdom attacked on 3 July in an attempt to prevent its seizure by Germany 100 London seen from St Paul s Cathedral after the German Blitz 29 December 1940 The air Battle of Britain 101 began in early July with Luftwaffe attacks on shipping and harbours 102 The United Kingdom rejected Hitler s peace offer 103 and the German air superiority campaign started in August but failed to defeat RAF Fighter Command forcing the indefinite postponement of the proposed German invasion of Britain The German strategic bombing offensive intensified with night attacks on London and other cities in the Blitz but failed to significantly disrupt the British war effort 102 and largely ended in May 1941 104 Using newly captured French ports the German Navy enjoyed success against an over extended Royal Navy using U boats against British shipping in the Atlantic 105 The British Home Fleet scored a significant victory on 27 May 1941 by sinking the German battleship Bismarck 106 In November 1939 the United States was taking measures to assist China and the Western Allies and amended the Neutrality Act to allow cash and carry purchases by the Allies 107 In 1940 following the German capture of Paris the size of the United States Navy was significantly increased In September the United States further agreed to a trade of American destroyers for British bases 108 Still a large majority of the American public continued to oppose any direct military intervention in the conflict well into 1941 109 In December 1940 Roosevelt accused Hitler of planning world conquest and ruled out any negotiations as useless calling for the United States to become an arsenal of democracy and promoting Lend Lease programmes of aid to support the British war effort 103 The United States started strategic planning to prepare for a full scale offensive against Germany 110 At the end of September 1940 the Tripartite Pact formally united Japan Italy and Germany as the Axis powers The Tripartite Pact stipulated that any country with the exception of the Soviet Union which attacked any Axis Power would be forced to go to war against all three 111 The Axis expanded in November 1940 when Hungary Slovakia and Romania joined 112 Romania and Hungary later made major contributions to the Axis war against the Soviet Union in Romania s case partially to recapture territory ceded to the Soviet Union 113 Mediterranean 1940 41 Main article Mediterranean and Middle East theatre of World War II Soldiers of the British Commonwealth forces from the Australian Army s 9th Division during the Siege of Tobruk North African Campaign August 1941 In early June 1940 the Italian Regia Aeronautica attacked and besieged Malta a British possession From late summer to early autumn Italy conquered British Somaliland and made an incursion into British held Egypt In October Italy attacked Greece but the attack was repulsed with heavy Italian casualties the campaign ended within months with minor territorial changes 114 Germany started preparation for an invasion of the Balkans to assist Italy to prevent the British from gaining a foothold there which would be a potential threat for Romanian oil fields and to strike against the British dominance of the Mediterranean 115 In December 1940 British Empire forces began counter offensives against Italian forces in Egypt and Italian East Africa 116 The offensives were highly successful by early February 1941 Italy had lost control of eastern Libya and large numbers of Italian troops had been taken prisoner The Italian Navy also suffered significant defeats with the Royal Navy putting three Italian battleships out of commission by means of a carrier attack at Taranto and neutralising several more warships at the Battle of Cape Matapan 117 German Panzer III of the Afrika Korps advancing across the North African desert 1941 Italian defeats prompted Germany to deploy an expeditionary force to North Africa and at the end of March 1941 Rommel s Afrika Korps launched an offensive which drove back the Commonwealth forces 118 In under a month Axis forces advanced to western Egypt and besieged the port of Tobruk 119 By late March 1941 Bulgaria and Yugoslavia signed the Tripartite Pact however the Yugoslav government was overthrown two days later by pro British nationalists Germany responded with simultaneous invasions of both Yugoslavia and Greece commencing on 6 April 1941 both nations were forced to surrender within the month 120 The airborne invasion of the Greek island of Crete at the end of May completed the German conquest of the Balkans 121 Although the Axis victory was swift bitter and large scale partisan warfare subsequently broke out against the Axis occupation of Yugoslavia which continued until the end of the war 122 In the Middle East in May Commonwealth forces quashed an uprising in Iraq which had been supported by German aircraft from bases within Vichy controlled Syria 123 Between June and July they invaded and occupied the French possessions Syria and Lebanon with the assistance of the Free French 124 Axis attack on the Soviet Union 1941 Main article Eastern Front World War II European theatre of World War II animation map 1939 1945 Red Western Allies and the Soviet Union after 1941 Green Soviet Union before 1941 Blue Axis powers With the situation in Europe and Asia relatively stable Germany Japan and the Soviet Union made preparations With the Soviets wary of mounting tensions with Germany and the Japanese planning to take advantage of the European War by seizing resource rich European possessions in Southeast Asia the two powers signed the Soviet Japanese Neutrality Pact in April 1941 125 By contrast the Germans were steadily making preparations for an attack on the Soviet Union massing forces on the Soviet border 126 Hitler believed that the United Kingdom s refusal to end the war was based on the hope that the United States and the Soviet Union would enter the war against Germany sooner or later 127 He therefore decided to try to strengthen Germany s relations with the Soviets or failing that to attack and eliminate them as a factor In November 1940 negotiations took place to determine if the Soviet Union would join the Tripartite Pact The Soviets showed some interest but asked for concessions from Finland Bulgaria Turkey and Japan that Germany considered unacceptable On 18 December 1940 Hitler issued the directive to prepare for an invasion of the Soviet Union 128 German soldiers during the invasion of the Soviet Union by the Axis powers 1941 On 22 June 1941 Germany supported by Italy and Romania invaded the Soviet Union in Operation Barbarossa with Germany accusing the Soviets of plotting against them They were joined shortly by Finland and Hungary 129 The primary targets of this surprise offensive 130 were the Baltic region Moscow and Ukraine with the ultimate goal of ending the 1941 campaign near the Arkhangelsk Astrakhan line from the Caspian to the White Seas Hitler s objectives were to eliminate the Soviet Union as a military power exterminate Communism generate Lebensraum living space 131 by dispossessing the native population 132 and guarantee access to the strategic resources needed to defeat Germany s remaining rivals 133 Although the Red Army was preparing for strategic counter offensives before the war 134 Barbarossa forced the Soviet supreme command to adopt a strategic defence During the summer the Axis made significant gains into Soviet territory inflicting immense losses in both personnel and materiel By mid August however the German Army High Command decided to suspend the offensive of a considerably depleted Army Group Centre and to divert the 2nd Panzer Group to reinforce troops advancing towards central Ukraine and Leningrad 135 The Kiev offensive was overwhelmingly successful resulting in encirclement and elimination of four Soviet armies and made possible further advance into Crimea and industrially developed Eastern Ukraine the First Battle of Kharkov 136 Soviet civilians leaving destroyed houses after a German bombardment during the Battle of Leningrad 10 December 1942 The diversion of three quarters of the Axis troops and the majority of their air forces from France and the central Mediterranean to the Eastern Front 137 prompted the United Kingdom to reconsider its grand strategy 138 In July the UK and the Soviet Union formed a military alliance against Germany 139 and in August the United Kingdom and the United States jointly issued the Atlantic Charter which outlined British and American goals for the postwar world 140 In late August the British and Soviets invaded neutral Iran to secure the Persian Corridor Iran s oil fields and preempt any Axis advances through Iran toward the Baku oil fields or British India 141 By October Axis operational objectives in Ukraine and the Baltic region were achieved with only the sieges of Leningrad 142 and Sevastopol continuing 143 A major offensive against Moscow was renewed after two months of fierce battles in increasingly harsh weather the German army almost reached the outer suburbs of Moscow where the exhausted troops 144 were forced to suspend their offensive 145 Large territorial gains were made by Axis forces but their campaign had failed to achieve its main objectives two key cities remained in Soviet hands the Soviet capability to resist was not broken and the Soviet Union retained a considerable part of its military potential The blitzkrieg phase of the war in Europe had ended 146 By early December freshly mobilised reserves 147 allowed the Soviets to achieve numerical parity with Axis troops 148 This as well as intelligence data which established that a minimal number of Soviet troops in the East would be sufficient to deter any attack by the Japanese Kwantung Army 149 allowed the Soviets to begin a massive counter offensive that started on 5 December all along the front and pushed German troops 100 250 kilometres 62 155 mi west 150 War breaks out in the Pacific 1941 Main article Pacific War Following the Japanese false flag Mukden Incident in 1931 the Japanese shelling of the American gunboat USS Panay in 1937 and the 1937 38 Nanjing Massacre Japanese American relations deteriorated In 1939 the United States notified Japan that it would not be extending its trade treaty and American public opinion opposing Japanese expansionism led to a series of economic sanctions the Export Control Acts which banned U S exports of chemicals minerals and military parts to Japan and increased economic pressure on the Japanese regime 103 151 152 During 1939 Japan launched its first attack against Changsha a strategically important Chinese city but was repulsed by late September 153 Despite several offensives by both sides the war between China and Japan was stalemated by 1940 To increase pressure on China by blocking supply routes and to better position Japanese forces in the event of a war with the Western powers Japan invaded and occupied northern Indochina in September 1940 154 Japanese soldiers entering Hong Kong 8 December 1941 Chinese nationalist forces launched a large scale counter offensive in early 1940 In August Chinese communists launched an offensive in Central China in retaliation Japan instituted harsh measures in occupied areas to reduce human and material resources for the communists 155 The continued antipathy between Chinese communist and nationalist forces culminated in armed clashes in January 1941 effectively ending their co operation 156 In March the Japanese 11th army attacked the headquarters of the Chinese 19th army but was repulsed during Battle of Shanggao 157 In September Japan attempted to take the city of Changsha again and clashed with Chinese nationalist forces 158 German successes in Europe encouraged Japan to increase pressure on European governments in Southeast Asia The Dutch government agreed to provide Japan with some oil supplies from the Dutch East Indies but negotiations for additional access to their resources ended in failure in June 1941 159 In July 1941 Japan sent troops to southern Indochina thus threatening British and Dutch possessions in the Far East The United States the United Kingdom and other Western governments reacted to this move with a freeze on Japanese assets and a total oil embargo 160 161 At the same time Japan was planning an invasion of the Soviet Far East intending to capitalise off the German invasion in the west but abandoned the operation after the sanctions 162 Since early 1941 the United States and Japan had been engaged in negotiations in an attempt to improve their strained relations and end the war in China During these negotiations Japan advanced a number of proposals which were dismissed by the Americans as inadequate 163 At the same time the United States the United Kingdom and the Netherlands engaged in secret discussions for the joint defence of their territories in the event of a Japanese attack against any of them 164 Roosevelt reinforced the Philippines an American protectorate scheduled for independence in 1946 and warned Japan that the United States would react to Japanese attacks against any neighboring countries 164 The USS Arizona was a total loss in the Japanese surprise air attack on the American Pacific Fleet at Pearl Harbor Sunday 7 December 1941 Frustrated at the lack of progress and feeling the pinch of the American British Dutch sanctions Japan prepared for war On 20 November a new government under Hideki Tojo presented an interim proposal as its final offer It called for the end of American aid to China and for lifting the embargo on the supply of oil and other resources to Japan In exchange Japan promised not to launch any attacks in Southeast Asia and to withdraw its forces from southern Indochina 163 The American counter proposal of 26 November required that Japan evacuate all of China without conditions and conclude non aggression pacts with all Pacific powers 165 That meant Japan was essentially forced to choose between abandoning its ambitions in China or seizing the natural resources it needed in the Dutch East Indies by force 166 167 the Japanese military did not consider the former an option and many officers considered the oil embargo an unspoken declaration of war 168 Japan planned to rapidly seize European colonies in Asia to create a large defensive perimeter stretching into the Central Pacific The Japanese would then be free to exploit the resources of Southeast Asia while exhausting the over stretched Allies by fighting a defensive war 169 170 To prevent American intervention while securing the perimeter it was further planned to neutralise the United States Pacific Fleet and the American military presence in the Philippines from the outset 171 On 7 December 1941 8 December in Asian time zones Japan attacked British and American holdings with near simultaneous offensives against Southeast Asia and the Central Pacific 172 These included an attack on the American fleets at Pearl Harbor and the Philippines Guam Wake Island landings in Malaya 172 Thailand and the Battle of Hong Kong 173 The Japanese invasion of Thailand led to Thailand s decision to ally itself with Japan and the other Japanese attacks led the United States United Kingdom China Australia and several other states to formally declare war on Japan whereas the Soviet Union being heavily involved in large scale hostilities with European Axis countries maintained its neutrality agreement with Japan 174 Germany followed by the other Axis states declared war on the United States 175 in solidarity with Japan citing as justification the American attacks on German war vessels that had been ordered by Roosevelt 129 176 Axis advance stalls 1942 43 US President Franklin D Roosevelt and British PM Winston Churchill seated at the Casablanca Conference January 1943 On 1 January 1942 the Allied Big Four 177 the Soviet Union China the United Kingdom and the United States and 22 smaller or exiled governments issued the Declaration by United Nations thereby affirming the Atlantic Charter 178 and agreeing not to sign a separate peace with the Axis powers 179 During 1942 Allied officials debated on the appropriate grand strategy to pursue All agreed that defeating Germany was the primary objective The Americans favoured a straightforward large scale attack on Germany through France The Soviets were also demanding a second front The British on the other hand argued that military operations should target peripheral areas to wear out German strength leading to increasing demoralisation and bolster resistance forces Germany itself would be subject to a heavy bombing campaign An offensive against Germany would then be launched primarily by Allied armour without using large scale armies 180 Eventually the British persuaded the Americans that a landing in France was infeasible in 1942 and they should instead focus on driving the Axis out of North Africa 181 At the Casablanca Conference in early 1943 the Allies reiterated the statements issued in the 1942 Declaration and demanded the unconditional surrender of their enemies The British and Americans agreed to continue to press the initiative in the Mediterranean by invading Sicily to fully secure the Mediterranean supply routes 182 Although the British argued for further operations in the Balkans to bring Turkey into the war in May 1943 the Americans extracted a British commitment to limit Allied operations in the Mediterranean to an invasion of the Italian mainland and to invade France in 1944 183 Pacific 1942 43 Map of Japanese military advances through mid 1942 By the end of April 1942 Japan and its ally Thailand had almost fully conquered Burma Malaya the Dutch East Indies Singapore and Rabaul inflicting severe losses on Allied troops and taking a large number of prisoners 184 Despite stubborn resistance by Filipino and US forces the Philippine Commonwealth was eventually captured in May 1942 forcing its government into exile 185 On 16 April in Burma 7 000 British soldiers were encircled by the Japanese 33rd Division during the Battle of Yenangyaung and rescued by the Chinese 38th Division 186 Japanese forces also achieved naval victories in the South China Sea Java Sea and Indian Ocean 187 and bombed the Allied naval base at Darwin Australia In January 1942 the only Allied success against Japan was a Chinese victory at Changsha 188 These easy victories over the unprepared US and European opponents left Japan overconfident as well as overextended 189 In early May 1942 Japan initiated operations to capture Port Moresby by amphibious assault and thus sever communications and supply lines between the United States and Australia The planned invasion was thwarted when an Allied task force centred on two American fleet carriers fought Japanese naval forces to a draw in the Battle of the Coral Sea 190 Japan s next plan motivated by the earlier Doolittle Raid was to seize Midway Atoll and lure American carriers into battle to be eliminated as a diversion Japan would also send forces to occupy the Aleutian Islands in Alaska 191 In mid May Japan started the Zhejiang Jiangxi campaign in China with the goal of inflicting retribution on the Chinese who aided the surviving American airmen in the Doolittle Raid by destroying Chinese air bases and fighting against the Chinese 23rd and 32nd Army Groups 192 193 In early June Japan put its operations into action but the Americans having broken Japanese naval codes in late May were fully aware of the plans and order of battle and used this knowledge to achieve a decisive victory at Midway over the Imperial Japanese Navy 194 US Marines during the Guadalcanal Campaign in the Pacific theatre 1942 With its capacity for aggressive action greatly diminished as a result of the Midway battle Japan chose to focus on a belated attempt to capture Port Moresby by an overland campaign in the Territory of Papua 195 The Americans planned a counter attack against Japanese positions in the southern Solomon Islands primarily Guadalcanal as a first step towards capturing Rabaul the main Japanese base in Southeast Asia 196 Both plans started in July but by mid September the Battle for Guadalcanal took priority for the Japanese and troops in New Guinea were ordered to withdraw from the Port Moresby area to the northern part of the island where they faced Australian and United States troops in the Battle of Buna Gona 197 Guadalcanal soon became a focal point for both sides with heavy commitments of troops and ships in the battle for Guadalcanal By the start of 1943 the Japanese were defeated on the island and withdrew their troops 198 In Burma Commonwealth forces mounted two operations The first an offensive into the Arakan region in late 1942 went disastrously forcing a retreat back to India by May 1943 199 The second was the insertion of irregular forces behind Japanese front lines in February which by the end of April had achieved mixed results 200 Eastern Front 1942 43 Red Army soldiers on the counterattack during the Battle of Stalingrad February 1943 Despite considerable losses in early 1942 Germany and its allies stopped a major Soviet offensive in central and southern Russia keeping most territorial gains they had achieved during the previous year 201 In May the Germans defeated Soviet offensives in the Kerch Peninsula and at Kharkov 202 and then launched their main summer offensive against southern Russia in June 1942 to seize the oil fields of the Caucasus and occupy the Kuban steppe while maintaining positions on the northern and central areas of the front The Germans split Army Group South into two groups Army Group A advanced to the lower Don River and struck south east to the Caucasus while Army Group B headed towards the Volga River The Soviets decided to make their stand at Stalingrad on the Volga 203 By mid November the Germans had nearly taken Stalingrad in bitter street fighting The Soviets began their second winter counter offensive starting with an encirclement of German forces at Stalingrad 204 and an assault on the Rzhev salient near Moscow though the latter failed disastrously 205 By early February 1943 the German Army had taken tremendous losses German troops at Stalingrad had been defeated 206 and the front line had been pushed back beyond its position before the summer offensive In mid February after the Soviet push had tapered off the Germans launched another attack on Kharkov creating a salient in their front line around the Soviet city of Kursk 207 Western Europe Atlantic and Mediterranean 1942 43 American 8th Air Force Boeing B 17 Flying Fortress bombing raid on the Focke Wulf factory in Germany 9 October 1943 Exploiting poor American naval command decisions the German navy ravaged Allied shipping off the American Atlantic coast 208 By November 1941 Commonwealth forces had launched a counter offensive Operation Crusader in North Africa and reclaimed all the gains the Germans and Italians had made 209 In North Africa the Germans launched an offensive in January pushing the British back to positions at the Gazala line by early February 210 followed by a temporary lull in combat which Germany used to prepare for their upcoming offensives 211 Concerns the Japanese might use bases in Vichy held Madagascar caused the British to invade the island in early May 1942 212 An Axis offensive in Libya forced an Allied retreat deep inside Egypt until Axis forces were stopped at El Alamein 213 On the Continent raids of Allied commandos on strategic targets culminating in the disastrous Dieppe Raid 214 demonstrated the Western Allies inability to launch an invasion of continental Europe without much better preparation equipment and operational security 215 page needed In August 1942 the Allies succeeded in repelling a second attack against El Alamein 216 and at a high cost managed to deliver desperately needed supplies to the besieged Malta 217 A few months later the Allies commenced an attack of their own in Egypt dislodging the Axis forces and beginning a drive west across Libya 218 This attack was followed up shortly after by Anglo American landings in French North Africa which resulted in the region joining the Allies 219 Hitler responded to the French colony s defection by ordering the occupation of Vichy France 219 although Vichy forces did not resist this violation of the armistice they managed to scuttle their fleet to prevent its capture by German forces 219 220 The Axis forces in Africa withdrew into Tunisia which was conquered by the Allies in May 1943 219 221 In June 1943 the British and Americans began a strategic bombing campaign against Germany with a goal to disrupt the war economy reduce morale and de house the civilian population 222 The firebombing of Hamburg was among the first attacks in this campaign inflicting significant casualties and considerable losses on infrastructure of this important industrial centre 223 Allies gain momentum 1943 44 U S Navy SBD 5 scout plane flying patrol over USS Washington and USS Lexington during the Gilbert and Marshall Islands campaign 1943 After the Guadalcanal Campaign the Allies initiated several operations against Japan in the Pacific In May 1943 Canadian and US forces were sent to eliminate Japanese forces from the Aleutians 224 Soon after the United States with support from Australia New Zealand and Pacific Islander forces began major ground sea and air operations to isolate Rabaul by capturing surrounding islands and breach the Japanese Central Pacific perimeter at the Gilbert and Marshall Islands 225 By the end of March 1944 the Allies had completed both of these objectives and had also neutralised the major Japanese base at Truk in the Caroline Islands In April the Allies launched an operation to retake Western New Guinea 226 In the Soviet Union both the Germans and the Soviets spent the spring and early summer of 1943 preparing for large offensives in central Russia On 4 July 1943 Germany attacked Soviet forces around the Kursk Bulge Within a week German forces had exhausted themselves against the Soviets deeply echeloned and well constructed defences 227 and for the first time in the war Hitler cancelled the operation before it had achieved tactical or operational success 228 This decision was partially affected by the Western Allies invasion of Sicily launched on 9 July which combined with previous Italian failures resulted in the ousting and arrest of Mussolini later that month 229 Red Army troops in a counter offensive on German positions at the Battle of Kursk July 1943 On 12 July 1943 the Soviets launched their own counter offensives thereby dispelling any chance of German victory or even stalemate in the east The Soviet victory at Kursk marked the end of German superiority 230 giving the Soviet Union the initiative on the Eastern Front 231 232 The Germans tried to stabilise their eastern front along the hastily fortified Panther Wotan line but the Soviets broke through it at Smolensk and by the Lower Dnieper Offensive 233 On 3 September 1943 the Western Allies invaded the Italian mainland following Italy s armistice with the Allies 234 Germany with the help of fascists responded by disarming Italian forces that were in many places without superior orders seizing military control of Italian areas 235 and creating a series of defensive lines 236 German special forces then rescued Mussolini who then soon established a new client state in German occupied Italy named the Italian Social Republic 237 causing an Italian civil war The Western Allies fought through several lines until reaching the main German defensive line in mid November 238 German operations in the Atlantic also suffered By May 1943 as Allied counter measures became increasingly effective the resulting sizeable German submarine losses forced a temporary halt of the German Atlantic naval campaign 239 In November 1943 Franklin D Roosevelt and Winston Churchill met with Chiang Kai shek in Cairo and then with Joseph Stalin in Tehran 240 The former conference determined the post war return of Japanese territory 241 and the military planning for the Burma campaign 242 while the latter included agreement that the Western Allies would invade Europe in 1944 and that the Soviet Union would declare war on Japan within three months of Germany s defeat 243 Ruins of the Benedictine monastery during the Battle of Monte Cassino Italian Campaign May 1944 From November 1943 during the seven week Battle of Changde the Chinese forced Japan to fight a costly war of attrition while awaiting Allied relief 244 245 246 In January 1944 the Allies launched a series of attacks in Italy against the line at Monte Cassino and tried to outflank it with landings at Anzio 247 On 27 January 1944 Soviet troops launched a major offensive that expelled German forces from the Leningrad region thereby ending the most lethal siege in history 248 The following Soviet offensive was halted on the pre war Estonian border by the German Army Group North aided by Estonians hoping to re establish national independence This delay slowed subsequent Soviet operations in the Baltic Sea region 249 By late May 1944 the Soviets had liberated Crimea largely expelled Axis forces from Ukraine and made incursions into Romania which were repulsed by the Axis troops 250 The Allied offensives in Italy had succeeded and at the expense of allowing several German divisions to retreat on 4 June Rome was captured 251 The Allies had mixed success in mainland Asia In March 1944 the Japanese launched the first of two invasions an operation against British positions in Assam India 252 and soon besieged Commonwealth positions at Imphal and Kohima 253 In May 1944 British forces mounted a counter offensive that drove Japanese troops back to Burma by July 253 and Chinese forces that had invaded northern Burma in late 1943 besieged Japanese troops in Myitkyina 254 The second Japanese invasion of China aimed to destroy China s main fighting forces secure railways between Japanese held territory and capture Allied airfields 255 By June the Japanese had conquered the province of Henan and begun a new attack on Changsha 256 Allies close in 1944 American troops approaching Omaha Beach during the invasion of Normandy on D Day 6 June 1944 On 6 June 1944 known as D Day after three years of Soviet pressure 257 the Western Allies invaded northern France After reassigning several Allied divisions from Italy they also attacked southern France 258 These landings were successful and led to the defeat of the German Army units in France Paris was liberated on 25 August by the local resistance assisted by the Free French Forces both led by General Charles de Gaulle 259 and the Western Allies continued to push back German forces in western Europe during the latter part of the year An attempt to advance into northern Germany spearheaded by a major airborne operation in the Netherlands failed 260 After that the Western Allies slowly pushed into Germany but failed to cross the Rur river in a large offensive In Italy Allied advance also slowed due to the last major German defensive line 261 German SS soldiers from the Dirlewanger Brigade tasked with suppressing the Warsaw Uprising against Nazi occupation August 1944 On 22 June the Soviets launched a strategic offensive in Belarus Operation Bagration that almost completely destroyed the German Army Group Centre 262 Soon after that another Soviet strategic offensive forced German troops from Western Ukraine and Eastern Poland The Soviets formed the Polish Committee of National Liberation to control territory in Poland and combat the Polish Armia Krajowa The Soviet Red Army remained in the Praga district on the other side of the Vistula and watched passively as the Germans quelled the Warsaw Uprising initiated by the Armia Krajowa 263 The national uprising in Slovakia was also quelled by the Germans 264 The Soviet Red Army s strategic offensive in eastern Romania cut off and destroyed the considerable German troops there and triggered a successful coup d etat in Romania and in Bulgaria followed by those countries shift to the Allied side 265 In September 1944 Soviet troops advanced into Yugoslavia and forced the rapid withdrawal of German Army Groups E and F in Greece Albania and Yugoslavia to rescue them from being cut off 266 By this point the Communist led Partisans under Marshal Josip Broz Tito who had led an increasingly successful guerrilla campaign against the occupation since 1941 controlled much of the territory of Yugoslavia and engaged in delaying efforts against German forces further south In northern Serbia the Soviet Red Army with limited support from Bulgarian forces assisted the Partisans in a joint liberation of the capital city of Belgrade on 20 October A few days later the Soviets launched a massive assault against German occupied Hungary that lasted until the fall of Budapest in February 1945 267 Unlike impressive Soviet victories in the Balkans bitter Finnish resistance to the Soviet offensive in the Karelian Isthmus denied the Soviets occupation of Finland and led to a Soviet Finnish armistice on relatively mild conditions 268 although Finland was forced to fight their former ally Germany 269 General Douglas MacArthur returns to the Philippines during the Battle of Leyte 20 October 1944 By the start of July 1944 Commonwealth forces in Southeast Asia had repelled the Japanese sieges in Assam pushing the Japanese back to the Chindwin River 270 while the Chinese captured Myitkyina In September 1944 Chinese forces captured Mount Song and reopened the Burma Road 271 In China the Japanese had more successes having finally captured Changsha in mid June and the city of Hengyang by early August 272 Soon after they invaded the province of Guangxi winning major engagements against Chinese forces at Guilin and Liuzhou by the end of November 273 and successfully linking up their forces in China and Indochina by mid December 274 In the Pacific US forces continued to press back the Japanese perimeter In mid June 1944 they began their offensive against the Mariana and Palau islands and decisively defeated Japanese forces in the Battle of the Philippine Sea These defeats led to the resignation of the Japanese Prime Minister Hideki Tojo and provided the United States with air bases to launch intensive heavy bomber attacks on the Japanese home islands In late October American forces invaded the Filipino island of Leyte soon after Allied naval forces scored another large victory in the Battle of Leyte Gulf one of the largest naval battles in history 275 Axis collapse Allied victory 1944 45 Yalta Conference held in February 1945 with Winston Churchill Franklin D Roosevelt and Joseph Stalin On 16 December 1944 Germany made a last attempt on the Western Front by using most of its remaining reserves to launch a massive counter offensive in the Ardennes and along with the French German border to split the Western Allies encircle large portions of Western Allied troops and capture their primary supply port at Antwerp to prompt a political settlement 276 By January the offensive had been repulsed with no strategic objectives fulfilled 276 In Italy the Western Allies remained stalemated at the German defensive line In mid January 1945 the Soviets and Poles attacked in Poland pushing from the Vistula to the Oder river in Germany and overran East Prussia 277 On 4 February Soviet British and US leaders met for the Yalta Conference They agreed on the occupation of post war Germany and on when the Soviet Union would join the war against Japan 278 In February the Soviets entered Silesia and Pomerania while Western Allies entered western Germany and closed to the Rhine river By March the Western Allies crossed the Rhine north and south of the Ruhr encircling the German Army Group B 279 In early March in an attempt to protect its last oil reserves in Hungary and to retake Budapest Germany launched its last major offensive against Soviet troops near Lake Balaton In two weeks the offensive had been repulsed the Soviets advanced to Vienna and captured the city In early April Soviet troops captured Konigsberg while the Western Allies finally pushed forward in Italy and swept across western Germany capturing Hamburg and Nuremberg American and Soviet forces met at the Elbe river on 25 April leaving several unoccupied pockets in southern Germany and around Berlin The German Reichstag after its capture by the Allied forces 3 June 1945 Soviet and Polish forces stormed and captured Berlin in late April In Italy German forces surrendered on 29 April On 30 April the Reichstag was captured signalling the military defeat of Nazi Germany 280 Berlin garrison surrendered on 2 May Several changes in leadership occurred during this period On 12 April President Roosevelt died and was succeeded by Harry S Truman Benito Mussolini was killed by Italian partisans on 28 April 281 Two days later Hitler committed suicide in besieged Berlin and he was succeeded by Grand Admiral Karl Donitz 282 Total and unconditional surrender in Europe was signed on 7 and 8 May to be effective by the end of 8 May 283 German Army Group Centre resisted in Prague until 11 May 284 In the Pacific theatre American forces accompanied by the forces of the Philippine Commonwealth advanced in the Philippines clearing Leyte by the end of April 1945 They landed on Luzon in January 1945 and recaptured Manila in March Fighting continued on Luzon Mindanao and other islands of the Philippines until the end of the war 285 Meanwhile the United States Army Air Forces launched a massive firebombing campaign of strategic cities in Japan in an effort to destroy Japanese war industry and civilian morale A devastating bombing raid on Tokyo of 9 10 March was the deadliest conventional bombing raid in history 286 Atomic bombing of Nagasaki on 9 August 1945 In May 1945 Australian troops landed in Borneo overrunning the oilfields there British American and Chinese forces defeated the Japanese in northern Burma in March and the British pushed on to reach Rangoon by 3 May 287 Chinese forces started a counterattack in the Battle of West Hunan that occurred between 6 April and 7 June 1945 American naval and amphibious forces also moved towards Japan taking Iwo Jima by March and Okinawa by the end of June 288 At the same time American submarines cut off Japanese imports drastically reducing Japan s ability to supply its overseas forces 289 On 11 July Allied leaders met in Potsdam Germany They confirmed earlier agreements about Germany 290 and the American British and Chinese governments reiterated the demand for unconditional surrender of Japan specifically stating that the alternative for Japan is prompt and utter destruction 291 During this conference the United Kingdom held its general election and Clement Attlee replaced Churchill as Prime Minister 292 The call for unconditional surrender was rejected by the Japanese government which believed it would be capable of negotiating for more favourable surrender terms 293 In early August the United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki Between the two bombings the Soviets pursuant to the Yalta agreement invaded Japanese held Manchuria and quickly defeated the Kwantung Army which was the largest Japanese fighting force 294 These two events persuaded previously adamant Imperial Army leaders to accept surrender terms 295 The Red Army also captured the southern part of Sakhalin Island and the Kuril Islands On 15 August 1945 Japan surrendered with the surrender documents finally signed at Tokyo Bay on the deck of the American battleship USS Missouri on 2 September 1945 ending the war 296 AftermathMain articles Aftermath of World War II and Consequences of Nazism Ruins of Warsaw in January 1945 after the deliberate destruction of the city by the occupying German forces The Allies established occupation administrations in Austria and Germany The former became a neutral state non aligned with any political bloc The latter was divided into western and eastern occupation zones controlled by the Western Allies and the Soviet Union A denazification programme in Germany led to the prosecution of Nazi war criminals in the Nuremberg trials and the removal of ex Nazis from power although this policy moved towards amnesty and re integration of ex Nazis into West German society 297 Germany lost a quarter of its pre war 1937 territory Among the eastern territories Silesia Neumark and most of Pomerania were taken over by Poland 298 and East Prussia was divided between Poland and the Soviet Union followed by the expulsion to Germany of the nine million Germans from these provinces 299 300 as well as three million Germans from the Sudetenland in Czechoslovakia By the 1950s one fifth of West Germans were refugees from the east The Soviet Union also took over the Polish provinces east of the Curzon line 301 from which 2 million Poles were expelled 300 302 north east Romania 303 304 parts of eastern Finland 305 and the three Baltic states were incorporated into the Soviet Union 306 307 Defendants at the Nuremberg trials where the Allied forces prosecuted prominent members of the political military judicial and economic leadership of Nazi Germany for crimes against humanity In an effort to maintain world peace 308 the Allies formed the United Nations which officially came into existence on 24 October 1945 309 and adopted the Universal Declaration of Human Rights in 1948 as a common standard for all member nations 310 The great powers that were the victors of the war France China the United Kingdom the Soviet Union and the United States became the permanent members of the UN s Security Council 311 The five permanent members remain so to the present although there have been two seat changes between the Republic of China and the People s Republic of China in 1971 and between the Soviet Union and its successor state the Russian Federation following the dissolution of the Soviet Union in 1991 The alliance between the Western Allies and the Soviet Union had begun to deteriorate even before the war was over 312 Post war border changes in Central Europe and creation of the Communist Eastern Bloc Germany had been de facto divided and two independent states the Federal Republic of Germany West Germany and the German Democratic Republic East Germany 313 were created within the borders of Allied and Soviet occupation zones The rest of Europe was also divided into Western and Soviet spheres of influence 314 Most eastern and central European countries fell into the Soviet sphere which led to establishment of Communist led regimes with full or partial support of the Soviet occupation authorities As a result East Germany 315 Poland Hungary Romania Czechoslovakia and Albania 316 became Soviet satellite states Communist Yugoslavia conducted a fully independent policy causing tension with the Soviet Union 317 Post war division of the world was formalised by two international military alliances the United States led NATO and the Soviet led Warsaw Pact 318 The long period of political tensions and military competition between them the Cold War would be accompanied by an unprecedented arms race and number of proxy wars throughout the world 319 In Asia the United States led the occupation of Japan and administered Japan s former islands in the Western Pacific while the Soviets annexed South Sakhalin and the Kuril Islands 320 Korea formerly under Japanese rule was divided and occupied by the Soviet Union in the North and the United States in the South between 1945 and 1948 Separate republics emerged on both sides of the 38th parallel in 1948 each claiming to be the legitimate government for all of Korea which led ultimately to the Korean War 321 David Ben Gurion proclaiming the Israeli Declaration of Independence at the Independence Hall 14 May 1948 In China nationalist and communist forces resumed the civil war in June 1946 Communist forces were victorious and established the People s Republic of China on the mainland while nationalist forces retreated to Taiwan in 1949 322 In the Middle East the Arab rejection of the United Nations Partition Plan for Palestine and the creation of Israel marked the escalation of the Arab Israeli conflict While European powers attempted to retain some or all of their colonial empires their losses of prestige and resources during the war rendered this unsuccessful leading to decolonisation 323 324 The global economy suffered heavily from the war although participating nations were affected differently The United States emerged much richer than any other nation leading to a baby boom and by 1950 its gross domestic product per person was much higher than that of any of the other powers and it dominated the world economy 325 The UK and US pursued a policy of industrial disarmament in Western Germany in the years 1945 1948 326 Because of international trade interdependencies this led to European economic stagnation and delayed European recovery for several years 327 328 Recovery began with the mid 1948 currency reform in Western Germany and was sped up by the liberalisation of European economic policy that the Marshall Plan 1948 1951 both directly and indirectly caused 329 330 The post 1948 West German recovery has been called the German economic miracle 331 Italy also experienced an economic boom 332 and the French economy rebounded 333 By contrast the United Kingdom was in a state of economic ruin 334 and although receiving a quarter of the total Marshall Plan assistance more than any other European country 335 it continued in relative economic decline for decades 336 The Soviet Union despite enormous human and material losses also experienced rapid increase in production in the immediate post war era 337 Japan recovered much later 338 China returned to its pre war industrial production by 1952 339 ImpactMain article Historiography of World War II Casualties and war crimes Main articles World War II casualties and List of war crimes committed during World War II World War II deaths Estimates for the total number of casualties in the war vary because many deaths went unrecorded 340 Most suggest that some 60 million people died in the war including about 20 million military personnel and 40 million civilians 341 342 343 Many of the civilians died because of deliberate genocide massacres mass bombings disease and starvation The Soviet Union alone lost around 27 million people during the war 344 including 8 7 million military and 19 million civilian deaths 345 A quarter of the total people in the Soviet Union were wounded or killed 346 Germany sustained 5 3 million military losses mostly on the Eastern Front and during the final battles in Germany 347 An estimated 11 348 to 17 million 349 civilians died as a direct or as an indirect result of Hitler s racist policies including mass killing of around 6 million Jews along with Roma homosexuals at least 1 9 million ethnic Poles 350 351 and millions of other Slavs including Russians Ukrainians and Belarusians and other ethnic and minority groups 352 349 Between 1941 and 1945 more than 200 000 ethnic Serbs along with gypsies and Jews were persecuted and murdered by the Axis aligned Croatian Ustase in Yugoslavia 353 Concurrently Muslims and Croats were persecuted and killed by Serb nationalist Chetniks 354 with an estimated 50 000 68 000 victims of which 41 000 were civilians 355 Also more than 100 000 Poles were massacred by the Ukrainian Insurgent Army in the Volhynia massacres between 1943 and 1945 356 At the same time about 10 000 15 000 Ukrainians were killed by the Polish Home Army and other Polish units in reprisal attacks 357 Chinese civilians being buried alive by soldiers of the Imperial Japanese Army during the Nanking Massacre December 1937 In Asia and the Pacific between 3 million and more than 10 million civilians mostly Chinese estimated at 7 5 million 358 were killed by the Japanese occupation forces 359 The most infamous Japanese atrocity was the Nanking Massacre in which fifty to three hundred thousand Chinese civilians were raped and murdered 360 Mitsuyoshi Himeta reported that 2 7 million casualties occurred during the Sankō Sakusen General Yasuji Okamura implemented the policy in Heipei and Shantung 361 Axis forces employed biological and chemical weapons The Imperial Japanese Army used a variety of such weapons during its invasion and occupation of China see Unit 731 362 363 and in early conflicts against the Soviets 364 Both the Germans and the Japanese tested such weapons against civilians 365 and sometimes on prisoners of war 366 The Soviet Union was responsible for the Katyn massacre of 22 000 Polish officers 367 and the imprisonment or execution of thousands of political prisoners by the NKVD along with mass civilian deportations to Siberia in the Baltic states and eastern Poland annexed by the Red Army 368 The mass bombing of cities in Europe and Asia has often been called a war crime although no positive or specific customary international humanitarian law with respect to aerial warfare existed before or during World War II 369 The USAAF firebombed a total of 67 Japanese cities killing 393 000 civilians and destroying 65 of built up areas 370 Genocide concentration camps and slave labour Main articles Genocide The Holocaust Nazi concentration camps Extermination camp Forced labour under German rule during World War II Kidnapping of children by Nazi Germany and Nazi human experimentation Schutzstaffel SS female camp guards removing prisoners bodies from lorries and carrying them to a mass grave inside the German Bergen Belsen concentration camp 1945 Nazi Germany under the dictatorship of Adolf Hitler was responsible for the Holocaust which killed approximately 6 million Jews as well as for killing 2 7 million ethnic Poles 371 and 4 million others who were deemed unworthy of life including the disabled and mentally ill Soviet prisoners of war Romani homosexuals Freemasons and Jehovah s Witnesses as part of a programme of deliberate extermination in effect becoming a genocidal state 372 Soviet POWs were kept in especially unbearable conditions and 3 6 million Soviet POWs out of 5 7 million died in Nazi camps during the war 373 374 In addition to concentration camps death camps were created in Nazi Germany to exterminate people on an industrial scale Nazi Germany extensively used forced labourers about 12 million Europeans from German occupied countries were abducted and used as a slave work force in German industry agriculture and war economy 375 The Soviet Gulag became a de facto system of deadly camps during 1942 43 when wartime privation and hunger caused numerous deaths of inmates 376 including foreign citizens of Poland and other countries occupied in 1939 40 by the Soviet Union as well as Axis POWs 377 By the end of the war most Soviet POWs liberated from Nazi camps and many repatriated civilians were detained in special filtration camps where they were subjected to NKVD evaluation and 226 127 were sent to the Gulag as real or perceived Nazi collaborators 378 Prisoner identity photograph taken by the German SS of a Polish girl deported to Auschwitz Approximately 230 000 children were held prisoner and used in forced labour and medical experiments Japanese prisoner of war camps many of which were used as labour camps also had high death rates The International Military Tribunal for the Far East found the death rate of Western prisoners was 27 per cent for American POWs 37 per cent 379 seven times that of POWs under the Germans and Italians 380 While 37 583 prisoners from the UK 28 500 from the Netherlands and 14 473 from the United States were released after the surrender of Japan the number of Chinese released was only 56 381 At least five million Chinese civilians from northern China and Manchukuo were enslaved between 1935 and 1941 by the East Asia Development Board or Kōain for work in mines and war industries After 1942 the number reached 10 million 382 In Java between 4 and 10 million rōmusha Japanese manual labourers were forced to work by the Japanese military About 270 000 of these Javanese labourers were sent to other Japanese held areas in South East Asia and only 52 000 were repatriated to Java 383 Occupation Main articles German occupied Europe Resistance during World War II Collaboration with the Axis Powers and Nazi plunder Polish civilians wearing blindfolds photographed just before their execution by German soldiers in Palmiry forest 1940 In Europe occupation came under two forms In Western Northern and Central Europe France Norway Denmark the Low Countries and the annexed portions of Czechoslovakia Germany established economic policies through which it collected roughly 69 5 billion reichsmarks 27 8 billion US dollars by the end of the war this figure does not include the sizeable plunder of industrial products military equipment raw materials and other goods 384 Thus the income from occupied nations was over 40 percent of the income Germany collected from taxation a figure which increased to nearly 40 percent of total German income as the war went on 385 Soviet partisans hanged by the German army The Russian Academy of Sciences reported in 1995 civilian victims in the Soviet Union at German hands totalled 13 7 million dead twenty percent of the 68 million persons in the occupied Soviet Union In the East the intended gains of Lebensraum were never attained as fluctuating front lines and Soviet scorched earth policies denied resources to the German invaders 386 Unlike in the West the Nazi racial policy encouraged extreme brutality against what it considered to be the inferior people of Slavic descent most German advances were thus followed by mass executions 387 Although resistance groups formed in most occupied territories they did not significantly hamper German operations in either the East 388 or the West 389 until late 1943 In Asia Japan termed nations under its occupation as being part of the Greater East Asia Co Prosperity Sphere essentially a Japanese hegemony which it claimed was for purposes of liberating colonised peoples 390 Although Japanese forces were sometimes welcomed as liberators from European domination Japanese war crimes frequently turned local public opinion against them 391 During Japan s initial conquest it captured 4 000 000 barrels 640 000 m3 of oil 5 5 105 tonnes left behind by retreating Allied forces and by 1943 was able to get production in the Dutch East Indies up to 50 million barrels 6 8 10 6 t 76 per cent of its 1940 output rate 391 Home fronts and production Main articles Military production during World War II and Home front during World War II Allies to Axis GDP ratio between 1938 and 1945 In Europe before the outbreak of the war the Allies had significant advantages in both population and economics In 1938 the Western Allies United Kingdom France Poland and the British Dominions had a 30 percent larger population and a 30 percent higher gross domestic product than the European Axis powers Germany and Italy if colonies are included the Allies had more than a 5 1 advantage in population and a nearly 2 1 advantage in GDP 392 In Asia at the same time China had roughly six times the population of Japan but only an 89 percent higher GDP this is reduced to three times the population and only a 38 percent higher GDP if Japanese colonies are included 392 The United States produced about two thirds of all the munitions used by the Allies in WWII including warships transports warplanes artillery tanks trucks and ammunition 393 Though the Allies economic and population advantages were largely mitigated during the initial rapid blitzkrieg attacks of Germany and Japan they became the decisive factor by 1942 after the United States and Soviet Union joined the Allies as the war largely settled into one of attrition 394 While the Allies ability to out produce the Axis is often attributed by whom to the Allies having more access to natural resources other factors such as Germany and Japan s reluctance to employ women in the labour force 395 Allied strategic bombing 396 and Germany s late shift to a war economy 397 contributed significantly Additionally neither Germany nor Japan planned to fight a protracted war and had not equipped themselves to do so 398 To improve their production Germany and Japan used millions of slave labourers 399 Germany used about 12 million people mostly from Eastern Europe 375 while Japan used more than 18 million people in Far East Asia 382 383 Advances in technology and warfare Main article Technology during World War II B 29 Superfortress strategic bombers on the Boeing assembly line in Wichita Kansas 1944 Aircraft were used for reconnaissance as fighters bombers and ground support and each role was advanced considerably Innovation included airlift the capability to quickly move limited high priority supplies equipment and personnel 400 and of strategic bombing the bombing of enemy industrial and population centres to destroy the enemy s ability to wage war 401 Anti aircraft weaponry also advanced including defences such as radar and surface to air artillery The use of the jet aircraft was pioneered and though late introduction meant it had little impact it led to jets becoming standard in air forces worldwide 402 Although guided missiles were being developed they were not advanced enough to reliably target aircraft until some years after the war Advances were made in nearly every aspect of naval warfare most notably with aircraft carriers and submarines Although aeronautical warfare had relatively little success at the start of the war actions at Taranto Pearl Harbor and the Coral Sea established the carrier as the dominant capital ship in place of the battleship 403 404 405 In the Atlantic escort carriers proved to be a vital part of Allied convoys increasing the effective protection radius and helping to close the Mid Atlantic gap 406 Carriers were also more economical than battleships because of the relatively low cost of aircraft 407 and their not requiring to be as heavily armoured 408 Submarines which had proved to be an effective weapon during the First World War 409 were anticipated by all sides to be important in the second The British focused development on anti submarine weaponry and tactics such as sonar and convoys while Germany focused on improving its offensive capability with designs such as the Type VII submarine and wolfpack tactics 410 better source needed Gradually improving Allied technologies such as the Leigh light hedgehog squid and homing torpedoes proved victorious over the German submarines 411 A V 2 rocket launched from a fixed site in Peenemunde 21 June 1943 Land warfare changed from the static front lines of trench warfare of World War I which had relied on improved artillery that outmatched the speed of both infantry and cavalry to increased mobility and combined arms The tank which had been used predominantly for infantry support in the First World War had evolved into the primary weapon 412 In the late 1930s tank design was considerably more advanced than it had been during World War I 413 and advances continued throughout the war with increases in speed armour and firepower citation needed At the start of the war most commanders thought enemy tanks should be met by tanks with superior specifications 414 This idea was challenged by the poor performance of the relatively light early tank guns against armour and German doctrine of avoiding tank versus tank combat This along with Germany s use of combined arms were among the key elements of their highly successful blitzkrieg tactics across Poland and France 412 Many means of destroying tanks including indirect artillery anti tank guns both towed and self propelled mines short ranged infantry antitank weapons and other tanks were used 414 Even with large scale mechanisation infantry remained the backbone of all forces 415 and throughout the war most infantry were equipped similarly to World War I 416 The portable machine gun spread a notable example being the German MG34 and various submachine guns which were suited to close combat in urban and jungle settings 416 The assault rifle a late war development incorporating many features of the rifle and submachine gun became the standard postwar infantry weapon for most armed forces 417 Nuclear Gadget being raised to the top of the detonation shot tower at Alamogordo Bombing Range Trinity nuclear test New Mexico July 1945 Most major belligerents attempted to solve the problems of complexity and security involved in using large codebooks for cryptography by designing ciphering machines the most well known being the German Enigma machine 418 Development of SIGINT signals intelligence and cryptanalysis enabled the countering process of decryption Notable examples were the Allied decryption of Japanese naval codes 419 and British Ultra a pioneering method for decoding Enigma benefiting from information given to the United Kingdom by the Polish Cipher Bureau which had been decoding early versions of Enigma before the war 420 Another aspect of military intelligence was the use of deception which the Allies used to great effect such as in operations Mincemeat and Bodyguard 419 421 Other technological and engineering feats achieved during or as a result of the war include the world s first programmable computers Z3 Colossus and ENIAC guided missiles and modern rockets the Manhattan Project s development of nuclear weapons operations research and the development of artificial harbours and oil pipelines under the English Channel citation needed Penicillin was first mass produced and used during the war see Stabilization and mass production of penicillin 422 See also World War II portal War portal Index of World War II articles Lists of World War II topics Outline of World War IINotes While various other dates have been proposed as the date on which World War II began or ended this is the time span most frequently cited Citations Weinberg 2005 p 6 Wells Anne Sharp 2014 Historical Dictionary of World War II The War against Germany and Italy Rowman amp Littlefield Publishing p 7 Ferris John Mawdsley Evan 2015 The Cambridge History of the Second World War Volume I Fighting the War Cambridge Cambridge University Press Forster amp Gessler 2005 p 64 Ghuhl Wernar 2007 Imperial Japan s World War Two Transaction Publishers pp 7 30 Polmar Norman Thomas B Allen 1991 World War II America at war 1941 1945 ISBN 978 0 394 58530 7 Seagrave Sterling 5 February 2007 post Feb 5 2007 03 15 PM The Education Forum Archived from the original on 13 June 2008 Retrieved 13 June 2008 Americans think of WW2 in Asia as having begun with Pearl Harbor the British with the fall of Singapore and so forth The Chinese would correct this by identifying the Marco Polo Bridge incident as the start or the Japanese seizure of Manchuria earlier Ben Horin 1943 p 169 Taylor 1979 p 124 Yisreelit Hevrah Mizrahit 1965 Asian and African Studies p 191 For 1941 see Taylor 1961 p vii Kellogg William O 2003 American History the Easy Way Barron s Educational Series p 236 ISBN 0 7641 1973 7 There is also the viewpoint that both World War I and World War II are part of the same European Civil War or Second Thirty Years War Canfora 2006 p 155 Prins 2002 p 11 Beevor 2012 p 10 In Many Ways Author Says Spanish Civil War Was The First Battle Of WWII NPR org Frank Willard C 1987 The Spanish Civil War and the Coming of the Second World War The International History Review 9 3 368 409 doi 10 1080 07075332 1987 9640449 JSTOR 40105814 via JSTOR Masaya 1990 p 4 History of German American Relations 1989 1994 Reunification Two plus Four Treaty Treaty on the Final Settlement with Respect to Germany September 12 1990 usa usembassy de Archived from the original on 7 May 2012 Retrieved 6 May 2012 Why Japan and Russia never signed a WWII peace treaty Archived 4 June 2018 at the Wayback Machine Asia Times Texts of Soviet Japanese Statements Peace Declaration Trade Protocol New York Times page 2 October 20 1956 Subtitle Moscow October 19 UP Following are the texts of a Soviet Japanese peace declaration and of a trade protocol between the two countries signed here today in unofficial translation from the Russian Quote The state of war between the U S S R and Japan ends on the day the present declaration enters into force Gerwarth Robert Paris Peace Treaties failed to create a secure peaceful and lasting world order The Irish Times Retrieved 29 October 2021 Ingram 2006 pp 76 78 Kantowicz 1999 p 149 Shaw 2000 p 35 Brody 1999 p 4 Zalampas 1989 p 62 Mandelbaum 1988 p 96 Record 2005 p 50 Schmitz 2000 p 124 Adamthwaite 1992 p 52 Shirer 1990 pp 298 99 Preston 1998 p 104 Myers amp Peattie 1987 p 458 Smith amp Steadman 2004 p 28 Coogan 1993 Although some Chinese troops in the Northeast managed to retreat south others were trapped by the advancing Japanese Army and were faced with the choice of resistance in defiance of orders or surrender A few commanders submitted receiving high office in the puppet government but others took up arms against the invader The forces they commanded were the first of the volunteer armies Busky 2002 p 10 Andrea L Stanton Edward Ramsamy Peter J Seybolt 2012 Cultural Sociology of the Middle East Asia and Africa An Encyclopedia p 308 ISBN 978 1 4129 8176 7 Archived from the original on 18 August 2018 Retrieved 6 April 2014 Barker 1971 pp 131 32 Shirer 1990 p 289 Kitson 2001 p 231 Neulen 2000 p 25 Payne 2008 p 271 Payne 2008 p 146 Eastman 1986 pp 547 51 Hsu amp Chang 1971 pp 195 200 Tucker Spencer C 2009 A Global Chronology of Conflict From the Ancient World to the Modern Middle East 6 volumes From the Ancient World to the Modern Middle East ABC CLIO ISBN 978 1 85109 672 5 Archived from the original on 18 August 2018 Retrieved 27 August 2017 via Google Books Yang Kuisong On the reconstruction of the facts of the Battle of Pingxingguan Levene Mark and Roberts Penny The Massacre in History 1999 pp 223 24 Totten Samuel Dictionary of Genocide 2008 298 99 Hsu amp Chang 1971 pp 221 30 Eastman 1986 p 566 Taylor 2009 pp 150 52 Sella 1983 pp 651 87 Beevor 2012 p 342 Goldman Stuart D 28 August 2012 The Forgotten Soviet Japanese War of 1939 The Diplomat Archived from the original on 29 June 2015 Retrieved 26 June 2015 Timothy Neeno Nomonhan The Second Russo Japanese War MilitaryHistoryOnline com Archived from the original on 24 November 2005 Retrieved 26 June 2015 Collier amp Pedley 2000 p 144 Kershaw 2001 pp 121 22 Kershaw 2001 p 157 Davies 2006 pp 143 44 2008 ed Shirer 1990 pp 461 62 Lowe amp Marzari 2002 p 330 Dear amp Foot 2001 p 234 Shirer 1990 p 471 Watson Derek 2000 Molotov s Apprenticeship in Foreign Policy The Triple Alliance Negotiations in 1939 Europe Asia Studies 52 4 695 722 doi 10 1080 713663077 JSTOR 153322 S2CID 144385167 Shore 2003 p 108 Dear amp Foot 2001 p 608 The German Campaign In Poland 1939 Archived from the original on 24 May 2014 Retrieved 29 October 2014 a b The Danzig Crisis ww2db com Archived from the original on 5 May 2016 Retrieved 29 April 2016 a b Major international events of 1939 with explanation Ibiblio org Archived from the original on 10 March 2013 Retrieved 9 May 2013 Evans 2008 pp 1 2 David T Zabecki 1 May 2015 World War II in Europe An Encyclopedia Routledge p 1663 ISBN 978 1 135 81242 3 The earliest fighting started at 0445 hours when marines from the battleship Schleswig Holstein attempted to storm a small Polish fort in Danzig the Westerplate The UK declared war on Germany at 11 AM France followed 6 hours later at 5 PM Keegan 1997 p 35 Cienciala 2010 p 128 observes that while it is true that Poland was far away making it difficult for the French and British to provide support f ew Western historians of World War II know that the British had committed to bomb Germany if it attacked Poland but did not do so except for one raid on the base of Wilhelmshaven The French who committed to attacking Germany in the west had no intention of doing so Beevor 2012 p 32 Dear amp Foot 2001 pp 248 49 Roskill 1954 p 64 James Bjorkman New Hope for Allied Shipping Archived 18 December 2018 at the Wayback Machine Retrieved 17 December 2018 Zaloga 2002 pp 80 83 Ginsburgs George 1958 A Case Study in the Soviet Use of International Law Eastern Poland in 1939 The American Journal of International Law 52 1 69 84 doi 10 2307 2195670 JSTOR 2195670 Hempel 2005 p 24 Zaloga 2002 pp 88 89 Nuremberg Documents C 62 GB86 a directive from Hitler in October 1939 which concludes The attack on France is to be launched this Autumn if conditions are at all possible Liddell Hart 1977 pp 39 40 Bullock 1990 pp 563 64 566 568 69 574 75 1983 ed Blitzkrieg From the Rise of Hitler to the 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historians however ascribe to the Communists the decisive role in Antonescu s overthrow Evans 2008 p 653 Wiest amp Barbier 2002 pp 65 66 Wiktor Christian L 1998 Multilateral Treaty Calendar 1648 1995 Kluwer Law International p 426 ISBN 978 90 411 0584 4 Shirer 1990 p 1085 Marston 2005 p 120 全面抗战 战犯前仆后继见阎王 The war criminals tries to be the first to see their ancestors Archived from the original on 3 March 2016 Retrieved 16 March 2013 Jowett amp Andrew 2002 p 8 Howard 2004 p 140 Drea 2003 p 54 Cook amp Bewes 1997 p 305 a b Parker 2004 pp xiii xiv 6 8 68 70 329 30 Glantz 2001 p 85 Beevor 2012 pp 709 22 Buchanan 2006 p 21 Shepardson 1998 O Reilly 2001 p 244 Kershaw 2001 p 823 Evans 2008 p 737 Glantz 1998 p 24 Chant Christopher 1986 The Encyclopedia of Codenames of World War II Routledge amp Kegan Paul p 118 ISBN 978 0 7102 0718 0 Long Tony 9 March 2011 March 9 1945 Burning the Heart Out of the Enemy Wired Wired Magazine Archived from the original on 23 March 2017 Retrieved 22 June 2018 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ISBN 978 0 8032 6638 4 de Grazia Victoria Paggi Leonardo Autumn 1991 Story of an Ordinary Massacre Civitella della Chiana 29 June 1944 Cardozo Studies in Law and Literature 3 2 153 69 doi 10 1525 lal 1991 3 2 02a00030 JSTOR 743479 Dunn Dennis J 1998 Caught Between Roosevelt amp Stalin America s Ambassadors to Moscow Lexington KY University Press of Kentucky ISBN 978 0 8131 2023 2 Eastman Lloyd E 1986 Nationalist China during the Sino Japanese War 1937 1945 In John K Fairbank Denis Twitchett eds The Cambridge History of China 13 Republican China 1912 1949 Part 2 Cambridge Cambridge University Press ISBN 978 0 521 24338 4 Ellman Michael 2002 Soviet Repression Statistics Some Comments PDF Europe Asia Studies 54 7 1151 1172 doi 10 1080 0966813022000017177 JSTOR 826310 S2CID 43510161 Archived from the original PDF on 22 November 2012 Copy Maksudov S 1994 Soviet Deaths in the Great Patriotic War A Note PDF Europe Asia Studies 46 4 671 80 doi 10 1080 09668139408412190 JSTOR 152934 PMID 12288331 Emadi Coffin Barbara 2002 Rethinking International Organization Deregulation and Global Governance London amp New York Routledge ISBN 978 0 415 19540 9 Erickson John 2001 Moskalenko In Shukman Harold ed Stalin s Generals London Phoenix Press pp 137 54 ISBN 978 1 84212 513 7 2003 The Road to Stalingrad London Cassell Military ISBN 978 0 304 36541 8 Evans David C Peattie Mark R 2012 1997 Kaigun Strategy Tactics and Technology in the Imperial Japanese Navy Annapolis MD Naval Institute Press ISBN 978 1 59114 244 7 Evans Richard J 2008 The Third Reich at War London Allen Lane ISBN 978 0 7139 9742 2 Fairbank John King Goldman Merle 2006 1994 China A New History 2nd ed Cambridge Harvard University Press ISBN 978 0 674 01828 0 Farrell Brian P 1993 Yes Prime Minister Barbarossa Whipcord and the Basis of British Grand Strategy Autumn 1941 Journal of Military History 57 4 599 625 doi 10 2307 2944096 JSTOR 2944096 Ferguson Niall 2006 The War of the World Twentieth Century Conflict and the Descent of the West Penguin ISBN 978 0 14 311239 6 Forrest Glen Evans Anthony Gibbons David 2012 The Illustrated Timeline of Military History New York The Rosen Publishing Group ISBN 978 1 4488 4794 5 Forster Stig Gessler Myriam 2005 The Ultimate Horror Reflections on Total War and Genocide In Roger Chickering Stig Forster Bernd Greiner eds A World at Total War Global Conflict and the Politics of Destruction 1937 1945 Cambridge Cambridge University Press pp 53 68 ISBN 978 0 521 83432 2 Frei Norbert 2002 Adenauer s Germany and the Nazi Past The Politics of Amnesty and Integration New York Columbia University Press ISBN a, wikipedia, wiki, book,

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