 Complete the following phrase:  The Allies, in this case involving Britain, the United States, Canada and Free France, 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 