The Normandy landings were the landing operations on Tuesday, 6 June 1944 of the Allied invasion of Normandy in Operation Overlord during World War II. Codenamed Operation Neptune and often referred to as D-Day, it was the largest seaborne invasion in history.
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.
Some of the ground forces of Operation Neptune and information on the different beaches:https://www.army.mil/d-day/history.html