Operation Barbarossa, or the German invasion of the Soviet Union, was the code name for the incursion of the Soviet Union by Nazi Germany and several of its Axis allies on June 22, 1941. The surger ...

The Battle of Britain was a World War II military operation in which the Royal Air Force (RAF) and the Royal Navy's Fleet Air Arm (FAA) defended the UK from large-scale Luftwaffe strikes. It wa ...

The Battle of France, known as the Western Campaign, the French Campaign, and the Fall of France, occurred during World War II when Germany invaded France, Belgium, Luxembourg, and the Netherlands. ...

Action Weserübung was Germany's Second World War attack on Denmark and Norway and the Norwegian Campaign's first operation. Germany captured Denmark and invaded Norway early on April 9 ...

World War II's most extended continuous military engagement, the Battle of the Atlantic, lasted from 1939 until Nazi Germany was defeated in 1945, encompassing a significant portion of the war& ...

The Soviet Union (USSR) and Finland fought the Winter War, the First Soviet-Finnish War. It started with a Soviet attack of Finland on 30 November 1939, three months after World War II broke out an ...

Throughout the first eight months of World War II, there was just one short military ground action on the Western Front, when French troops invaded Germany's Saar territory. Then, on 1 Septembe ...

The attack of Poland, also known as the September Campaign, the 1939 defensive war, and the Poland campaign, was a Nazi Germany and Soviet Union attack on the Republic of Poland that marked the sta ...

The Dunkirk evacuation, codenamed Operation Dynamo and often known as the Miracle of Dunkirk, or simply Dunkirk, was a World War II evacuation of Allied soldiers from the beaches and harbor of Dunk ...

The League of Nations was the initial worldwide organization whose principal goal was to keep the world in harmony. It began operations on 10 January 1920, following the Paris Peace Conference that ...