Operation Overlord, popularly known as D-Day, was the largest seaborne invasion in history. Under the supreme command of General Dwight D. Eisenhower, Allied forces from the U.S., Great Britain, Canada, and other nations landed on five beaches along a 50-mile stretch of the heavily fortified coast of Normandy, France. The invasion required massive planning, including a sophisticated deception campaign to convince the Germans the attack would occur elsewhere. Despite heavy casualties, particularly on Omaha Beach, the Allies successfully established a beachhead. This opened the 'Second Front' in Europe, allowing for the liberation of Paris and the eventual push into Germany from the west. D-Day is celebrated as a major turning point in the European theater, signaling the beginning of the end for Nazi Germany's occupation of the continent.