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D-Day was June 6, 1944. It was the day that the Allied forces landed on the beaches of Normandy, France, during World War II. The operation was one of the largest amphibious invasions in history and eventually led to the liberation of France and the defeat of Nazi Germany. The planning and preparation for D-Day took months and involved thousands of troops, ships, and aircraft. The success of the operation was a turning point in the war and helped pave the way for the eventual Allied victory.