The Allies in this case involving Britain, the U.S, and Canada coordinated a massive build-up of troops and supplies to support a large-scale invasion of Normandy in the D-Day landings on 6 June 1944 under the code name Operation Overlord. The Germans were dug into fortified emplacements above the beaches. Caen, Cherbourg, Carentan, Falaise and other Norman towns endured many casualties in the Battle of Normandy, which continued until the closing of the so-called Falaise gap between Chambois and Mont Ormel. The liberation of Le Havre followed.