Operation Sabine
After the coup Iraq’s new Prime Minister Rashid Ali reaffirmed to the British ambassador that the new government would continue to honour the Anglo-Iraqi Treaty. However this assurance was not accepted at face value by the Foreign Office, and the ambassador was immediately withdrawn to be replaced by Kinahan Cornwallis, who having spent 20 years as the adviser to former King Faisal I, was considered to be more able to take a forceful position to the new Iraqi regime. At RAF Habbaniya Air Vice Marshal Harry Smart, the Air Officer Commanding, was also wary of the new government’s position and requested reinforcements, particularly modern aircraft. Still believing the Anglo-Iraqi Treaty to be effective London rejected this, and instead counselled diplomacy, although by the 8th July Operation Sabine was initiated and Indian troops that been destined for deployment to Malaya were redirected to Iraq.
At RAF Habbaniya the instructors of 4 Flying Training School started to prepare both the base and their aircraft for the possibility of combat operations. Against official directions 12 Hawker Audax trainers were fitted with Hawker Hart bomb racks, while another 9 were able to be fitted with the smaller Audax standard racks. Additionally the 27 Airspeed Oxford I’s were modified to carry bombs semi-internally. While the base itself was surrounded by perimeter fencing, the runways were outside the wire and exposed. The golf course and polo pitch, which were inside the perimeter, were rolled flat to provide secure overnight dispersal and a small relief landing field.
On the 12th July troopships carrying the 10th Indian Infantry Division and the Royal Artillery's 3rd Field Regiment, without their guns, departed from Karachi. The troopships were supported by Royal Naval vessels including the aircraft carrier HMS Hermes, who were tasked to support the disembarkation of the troops at Basra in the event that their landing was to be opposed by Iraqi forces.
The Iraqi government was advised that Britain would be transiting troops through the country enroute to Mandatory Palestine – even though their real intention was to reinforce the two British Iraqi bases – on the 16th July, and expressed no objections.
Over the 17th and 18th July the 1st Battalion King's Own Royal Regiment was airlifted into RAF Shaibah from Karachi on Armstrong Whitworth A.W.XV Atalanta, Douglas DC-2 and Vickers Valentia transports. The KORR were tasked to provide defensive support to the arriving convoy in the event of Iraqi resistance, but the Iraqis choose to not oppose the landings and over the 18th and 19th the Indian troops were disembarked at Basra. Positioning themselves to secure the port, power station and airfield it became rapidly apparent that the new arrivals were remaining in rather than transiting through Iraq, and on the 21st Rashid Ali declared this a violation of the Anglo-Iraqi Treaty and forbade any further reinforcements.
On the 23rd June the British ambassador advised Rashid Ali that another convoy was inbound with additional troops, and was in turn advised that Iraq would consider that their disembarkation would be an act of war. On the 29th July three troopships carrying the remaining elements of the 20th Infantry Brigade docked at Basra. Reading the escalating tension, the British ambassador issued an advice to British civilians in Baghdad to leave the city and opened the gates of RAF Habbaniya to them. As transport flights now brought the KORR to reinforce the base, the civilians were flown south to Basra.
Although the disembarkation of the remaining Indians troops was unopposed in Basra, in Baghdad Iraqi troops were mobilised.