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Japan invades Manchuria.
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Fascist Italy invades, conquers, and annexes Ethiopia.
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Nazi Germany and Fascist Italy sign a treaty of cooperation on October 25; on November 1, the Rome-Berlin Axis is announced.
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Nazi Germany and Imperial Japan sign the Anti-Comintern Pact.
This is directed against the Soviet Union and the international Communist movement. -
Japan invades China, initiating World War II in the Pacific.
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Germany, Italy, Great Britain, and France sign the Munich agreement which forces the Czechoslovak Republic to cede the Sudetenland, including the key Czechoslovak military defense positions, to Nazi Germany.
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France and Great Britain guarantee the integrity of the borders of the Polish state.
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Germany invades Poland, initiating World War II in Europe.
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Honoring their guarantee of Poland’s borders, Great Britain and France declare war on Germany.
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The Soviet Union invades Poland from the east.
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Warsaw surrenders on September 27.
The Polish government flees into exile via Romania. Germany and the Soviet Union divide Poland between them. -
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The Soviet Union invades Finland.
Initiating the so-called Winter War, the Finns sue for an armistice and have to cede the northern shores of Lake Lagoda and the small Finnish coastline on the Arctic Sea to the Soviet Union. -
Slovakia, Hungary, and Romania join the Axis.
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Germany invades Denmark and Norway.
Denmark surrenders on the day of the attack; Norway holds out until June 9. -
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Germany attacks western Europe—France and the neutral Low Countries.
Luxembourg is occupied on May 10; the Netherlands surrenders on May 14; and Belgium surrenders on May 28. On June 22, France signs an armistice agreement by which the Germans occupy the northern half of the country and the entire Atlantic coastline. In southern France, a collaborationist regime with its capital in Vichy is established. -
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The Soviet Union occupies the Baltic States on June 14–18.
Engineering Communist coup d’états in each of them on July 14–15, and then annexing them as Soviet Republics on August 3–6. -
Italy enters the war.
Italy invades southern France on June 21st. -
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Battle of Britain ends.
The air war ends in a defeat for Nazi Germany. -
Second Vienna Award.
Germany and Italy arbitrate a decision on the division of the disputed province of Transylvania between Romania and Hungary. The loss of northern Transylvania forces Romanian King Carol to abdicate in favor of his son, Michael, and brings to power a dictatorship under General Ion Antonescu. -
Germany, Italy, and Japan sign the Tripartite Pact.
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Italy invades Greece from Albania
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Bulgaria joins the Axis.
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Germany, Italy, Hungary, and Bulgaria invade and dismember Yugoslavia
Yugoslavia surrenders on April 17. Germany and Bulgaria invade Greece in support of the Italians. Resistance in Greece ceases in early June 1941. -
The leaders of the terrorist Ustasa movement proclaim the so-called Independent State of Croatia.
Recognized immediately by Germany and Italy, the new state includes the province of Bosnia-Herzegovina. Croatia joins the Axis powers formally on June 15, 1941. -
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Hitler's big mistake. Nazi Germany and its Axis partners (except Bulgaria) invade the Soviet Union.
Finland, seeking redress for the territorial losses in the armistice concluding the Winter War, joins the Axis just before the invasion. The Germans quickly overrun the Baltic States and, joined by the Finns, lay siege to Leningrad (St. Petersburg) by September. In the center, the Germans capture Smolensk in early August and drive on Moscow by October. In the south, German and Romanian troops capture Kiev (Kyiv) in September and capture Rostov on the Don River in November. -
British and US navies halt the Japanese naval advance in the central Pacific at Midway.
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US troops halt the Japanese island-hopping advance towards Australia at Guadalcanal in the Solomon Islands.
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The British bomb Köln (Cologne)
This brings the war home to Germany for the first time. Over the next three years, Anglo-American bombing reduces urban Germany to rubble. -
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Germany and her Axis partners launch a new offensive in the Soviet Union.
German troops fight their way into Stalingrad (Volgograd) on the Volga River by mid-September and penetrate deep into the Caucasus after securing the Crimean Peninsula. -
British troops defeat the Germans and Italians at El Alamein in Egypt.
This sends the Axis forces in chaotic retreat across Libya to the eastern border of Tunisia. -
US and British troops land at several points on the beaches of Algeria and Morocco in French North Africa.
The failure of the Vichy French troops to defend against the invasion enables the Allies to move swiftly to the western border of Tunisia, and triggers the German occupation of southern France on November 11. -
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Soviet troops counterattack.
They break through the Hungarian and Romanian lines northwest and southwest of Stalingrad and trap the German Sixth Army in the city. Forbidden by Hitler to retreat or try to break out of the Soviet ring, the survivors of the Sixth Army surrender on January 30 and February 2, 1943. -
Japan bombs Pearl Harbor.
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The United States declares war on Japan, entering World War II.
Japanese troops land in the Philippines, French Indochina (Vietnam, Laos, Cambodia), and British Singapore. By April 1942, the Philippines, Indochina, and Singapore are under Japanese occupation. -
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Nazi Germany and the Axis Powers declare war on the United States.
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Axis forces in Tunisia surrender to the Allies.
This ends the North African campaign. -
The Germans launch a massive tank offensive
Near Kursk in the Soviet Union, the Soviets blunt the attack within a week and begin an offensive initiative of their own. -
US and British troops land on Sicily.
By mid-August, the Allies control Sicily. -
The Fascist Grand Council deposes Benito Mussolini.
This allows Italian marshall Pietro Badoglio to form a new government. -
The Badoglio government surrenders unconditionally to the Allies.
The Germans immediately seize control of Rome and northern Italy, establishing a puppet Fascist regime under Mussolini, who is freed from imprisonment by German commandos on September 12. -
Allied troops land on the beaches of Salerno near Naples.
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Fearing Hungary’s intention to desert the Axis partnership, the Germans occupy Hungary and compel the regent, Admiral Miklos Horthy, to appoint a pro-German minister president.
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Allied troops liberate Rome.
Within six weeks, Anglo-American bombers could hit targets in eastern Germany for the first time. -
British, US, and Canadian troops successfully land on the Normandy beaches of France
This opens a "Second Front" on the Germans. -
The Soviets launch a massive offensive in eastern Belorussia (Belarus).
This destroys the German Army Group Center and allows the Soviets to move westward to the Vistula River across from Warsaw in central Poland by August 1. -
Allied forces break out of the Normandy beachhead and race eastward towards Paris.
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The Germans launch a final offensive in the west
This is known as the Battle of the Bulge, in an attempt to re-conquer Belgium and split the Allied forces along the German border. By January 1, 1945, the Germans are in retreat. -
The Soviets launch a new offensive
Liberating Warsaw and Krakow in January, capturing Budapest after a two-month siege on February 13, driving the Germans and their Hungarian collaborators out of Hungary in early April, forcing the surrender of Slovakia with the capture of Bratislava on April 4, and capturing Vienna on April 13. -
The Soviets launch their final offensive, encircling Berlin.
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Hitler commits suicide.
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Germany Surrenders.
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The United States drops an atomic bomb on Hiroshima.
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The Soviet Union declares war on Japan and invades Manchuria.
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The United States drops an atomic bomb on Nagasaki.
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Japan formally surrenders, ending World War II.