The famous battle fought on June 6, 1944, during World War II, is known as D-Day, which marked the beginning of the Allied invasion of Nazi-occupied France. The operation, codenamed Operation Overlord, involved a massive assault on the beaches of Normandy, where Allied forces landed to establish a foothold in Europe. This military campaign was one of the largest amphibious invasions in history and played a crucial role in the liberation of Western Europe from Nazi control. The success of D-Day was pivotal in changing the course of the war and ultimately led to the defeat of Nazi Germany.