Before the June 1944 D-Day invasion of Normandy, the Allies launched a deception codenamed Operation Bodyguard. As part of Bodyguard, the Operation Quicksilver deception portrayed First United States Army Group (FUSAG), a skeleton headquarters commanded by Omar Bradley, as an army group commanded by George Patton. In Operation Fortitude South, another component of Bodyguard, the Germans were persuaded that FUSAG would invade France at Pas-de-Calais in the fall of 1944. British and American troops used dummy equipment, false radio traffic and double agents (see Double-Cross System) to deceive German intelligence on the location and timing of the invasion. The Germans awaited the Calais landing for many weeks after the real landings in Normandy, leaving in place near Calais several divisions that could have helped delay or defeat the Normandy attack. By the time the Germans realized the Normandy landings were the actual offensive, Allied units were so well established in Normandy that they could not be dislodged.