Some of the first American soldiers to attack the German defenses in Higgins Boats (LCVPs) approach Omaha Beach near Normandy, France on June 6, 1944. Plastic covers protect the soldier's weapons against from the water. (Photo by Robert F. Sargent, U.S. Coast Guard/Galerie Bilderwelt/Getty Images)
Operation Overlord, (also known as D-Day), began on June 6, 1944, when some 156,000 American, British and Canadian forces landed on five beaches along a 50-mile stretch of the heavily fortified coast of France’s Normandy region. The invasion was one of the largest amphibious military assaults in history and required extensive planning.