During the Second World War, the British Army created several field corps; these were formations that controlled multiple divisions in addition to artillery, engineers, and logistical units that would be used to support the divisions as needed. A corps itself was generally under the control of a higher formation such as a field army, an army group or a command. During the war, the British military contained 16 field corps and three that were intended to control anti-aircraft units; the latter were not comparable in role to formations, which were intended to control divisions in combat; anti-aircraft units were assigned to control anti-aircraft formations within a designated area, which could cover hundreds or thousands of square miles. Through deception efforts, a further 11 corps existed