June 6th, 1944: More than 150,000 Allied troops land on the beaches of Normandy, France, as part of the largest seaborne invasion in history. Known as "D-Day," the name and date loom large in the memory of World War II—perhaps second only to December 7th, 1941. These two dates stand on opposite ends of American involvement in the war, and their meaning could not be more different. D-Day put the Allies on a decisive path toward victory. Beginning with the Normandy beaches, they pushed back against Axis forces until Germany was forced to surrender less than a year later. Their achievements were not accomplished without tremendous sacrifice, however, as the Normandy invasion resulted in over 6,000 American casualties.