During the Rashid Ali rebellion in 1941 the base was besieged by the Iraqi Army encamped on the overlooking plateau. The siege was lifted by the units based at Habbaniya, including pilots from the training school, a battalion of the King's Own Royal Regiment flown in at the last moment, No. 1 Armoured Car Company RAF, and the RAF's Iraq Levies. The subsequent arrival of a relief column (Kingcol), part of Habforce sent from Palestine, then a British mandate, combined with the Habbaniya units to force the rebel forces to retreat to Baghdad.