 The town of Dieppe was the site of the unsuccessful Dieppe Raid by Canadian and British armed forces.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.