The Allied invasion of Normandy, known as Operation Overlord, began on June 6, 1944 (D-Day) with the largest amphibious invasion in history. More than 160,000 troops from the United States, Britain, Canada, and Free France landed along a 50-mile stretch of the Normandy coast of northern France. The invasion was commanded by American General Dwight Eisenhower and British General Bernard Montgomery. It resulted in a resounding Allied victory, securing the beachhead and beginning the liberation of German-occupied northwestern Europe from Nazi control.