Strangeways devised and implemented the deception Operation Quicksilver, a significant part of Operation Fortitude, with the intent of fooling the Germans that the Allied invasion would take place in the Pas-de-Calais area. After the Allied landings in Normandy in June 1944, R Force moved to the continent where it operated under the 21st Army Group. It was one of the first units to enter Brussels and Rouen, and later conducted a deception campaign for the crossing of the Rhine River.