The Battle of Normandy

The Battle of Normandy was fought in 1944 between the German forces occupying Western Europe and the invading Allied forces as part of the larger conflict of World War II. Sixty years later, the Normandy invasion, codenamed Operation Overlord, remains the largest seaborne invasion in history, involving almost three million troops crossing the English Channel from England to Normandy in occupied France.

Twelve Allied nations provided units that participated in the invasion: Australia, Belgium, Canada, Czechoslovakia, France, Greece, the Netherlands, New Zealand, Norway, Poland, the United Kingdom and the United States.

The Normandy invasion began with overnight airborne paratrooper and glider landings, massive air and naval bombardments, and an early morning amphibious assault on June 6, "D-day". The battle for Normandy continued for more than two months, with campaigns to establish, expand, and eventually break out of the Allied beachheads. It concluded with the liberation of Paris and the fall of the Chambois pocket.

Reference:
Wikipedia article on The Battle of Normandy