<Li> Raids on the Atlantic Wall </Li> <Li> Battle of Atlantic </Li> <P> The Western Allies of World War II launched the largest amphibious invasion in history when they assaulted Normandy, located on the northern coast of France, on 6 June 1944 . The invaders were able to establish a beachhead as part of Operation Overlord after a successful "D - Day," the first day of the invasion . </P> <P> Allied land forces came from the United States, Britain, Canada, and Free French forces . In the weeks following the invasion, Polish forces and contingents from Belgium, Czechoslovakia, Greece and the Netherlands participated in the ground campaign; most also provided air and naval support alongside elements of the Royal Australian Air Force, the Royal New Zealand Air Force, and the Royal Norwegian Navy . </P>

When did they storm the beaches of normandy