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The German invasion of Poland in September 1939 marked the beginning of World War II. This aggressive action by Nazi Germany led Britain and France to declare war on Germany.

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In May 1940, Germany launched a rapid invasion of France. The French defense was overwhelmed, leading to the occupation of Paris and eventual French surrender in June.

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In June 1941, Nazi Germany launched Operation Barbarossa, the largest military operation in history, invading the Soviet Union. This marked a crucial turning point in the war as it opened the Eastern Front.

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Following the attack on Pearl Harbor by Japan in December 1941, the United States officially entered World War II, declaring war on Japan and later on Germany and Italy.

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The Battle of Stalingrad started in August 1942 and became one of the bloodiest battles in history. It was a significant turning point, as the Soviet Union began to push back the German forces.

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In January 1943, the Casablanca Conference was held with Allied leaders discussing the next phase of the war, including the concept of 'unconditional surrender' for the Axis powers.

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The Tehran Conference of November 1943 was the first major meeting between the 'Big Three' Allied leaders: Joseph Stalin, Franklin D. Roosevelt, and Winston Churchill, setting strategies for the war's final phase.

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On June 6, 1944, D-Day marked the Allies' invasion of Nazi-occupied France, a significant step toward liberating Europe from Nazi control. The operation included extensive coordination among the Allied forces.

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In February 1945, the Yalta Conference was held where the Allied leaders discussed the post-war reorganization of Europe, setting the stage for the Cold War and the division of Germany.

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On May 7, 1945, Germany signed an unconditional surrender. This event marked the end of World War II in Europe, leading to the Victory in Europe (VE) Day on May 8.