On April 20 the Iraqi Army established itself on the high ground to the south of the Habbaniyah air force base. An Iraqi envoy was sent to demand that no movements, either ground or air, were to take place from the base. The British refused the demand and then themselves demanded that the Iraqi army leave the area at once. After a further ultimatum given in the early hours of May 2 expired, at 0500 hours the British began bombing the Iraqi troops threatening the base, marking the beginning of the Anglo-Iraqi War.