June 6, 1944-This was the code name for Operation Overlord, the Allied invasion of Nazi-occupied France, on June 6, 1944. It remains the largest amphibious (water to land) assault in history with over 156,000 men crossing the English Channel in 6,939 vessels. From the French beaches, American and British forces pushed east to Germany. This marked the beginning of victory for the Allies in Europe.