Advanced Headquarters 'A' Force, generally referred to as 'A' Force, was the name of a deception department during the Second World War. Set up in Cairo in March 1941 and based in Cairo under Brigadier Dudley Clarke. General Archibald Wavell, the commander of forces in North Africa at the outbreak of war, initiated the use of deception as part of Operation Compass, in December 1944. After the success of Compass, Wavell sent for Clarke, with whom he had earlier worked in Palestine. Clarke was charged with forming the first deception department, in secret with limited resources.