RAF Squadrons in May 1940
Aircrafts and bases of the Royal Air Force

In January 1940 it was decided to unite the Air Component and the Advanced Air Striking Force under the command of the Air Officer Commanding-in-Chief British Air Forces in France, Air Marshal Barratt. As soon as possible after its arrival in France, the RAF took part in operations which brought it in contact with German aircraft. Although a number of German machines were shot down, RAF losses were heavy as many of their planes (the Fairey Battles and Blenheims for example) were found to be inadequately armed and ill-suited to combat with modern fighter planes like the Messerschmitt Bf109.

Picture: A trio of Bristol Blenheim IV bombers. The Blenheim was found to be extremely vulnerable to modern fighters.

Britain was anxious not to squander its precious aircraft by using them as a sort of fire brigade at the beck and call of the Allied land forces. The RAF wanted to ensure that its bombers were only used to cause maximum destruction to the enemy, although strategic bombing of targets in Germany was only authorised on 15 May 1940. Fighters based in France and England were to be deployed against the enemy as long as it did not impair Britain's ability to defend herself. On 10 May 1940, 416 of Britain's total number of 1,873 first-line aircraft were stationed in France, but on 20 May it was decided to bring back to England the remaining 66 fighters so that they could continue the war from English airfields.
The first phase of the German plan for the invasion of England was to gain control of the air and so during the months of July and August 1940 the RAF prepared its forces for the inevitable battle against the Luftwaffe.

The responsibilities of the RAF in the Mediterranean theatre were complex and wide-ranging, covering a vast geographical area and calling for action in a variety of different roles ranging from ground support work to strategic bombing. Until 1942 the RAF was often short of aircraft and equipment but following the Axis defeat at El Alamein and the arrival of American forces in North Africa the RAF was able to build up a material superiority that was to play a decisive part in securing victory in the Mediterranean.

Picture: Gloster Gladiator biplane fighters of No.80 squadron in North Africa. The unit was later moved to Greece to support the Greek army.

The peacetime responsibilities of the Air Officer Commanding, Middle East, encompassed the air forces in Egypt, Palestine, the Sudan, and Kenya, but in the event of war he was also to control the air element in Aden, Malta and Iraq. This vast Command was subsequently expanded to include Persia and the remainder of the Mediterranean theatre up to 100 miles west of Malta. The period between September 1939 and the Italian declaration of war in June 1940 was used to build up the RAF's capabilities in the Middle East within the limitations imposed by the maintenance of the air defence of Great Britain and by operations in France. Yet when Italy declared war the RAF was still greatly outnumbered by the Regia Aeronautica, with the Middle East Air Force comprising only 29 squadrons many of which were equipped with aircraft approaching obsolescence.
The Middle East Air Force was to operate against the Italians in two main theatres, the Mediterranean, and East Africa and the Red Sea; the first attacks being launched on 11 June 1940.
By the end of the year a considerable measure of air superiority had been achieved but a further battlefront was created by the Italian invasion of Greece on 28 October, to which the RAF responded by sending nine squadrons to support the Greek Army.

Active RAF Squadrons on 10 May 1940:

Note: Squadron Nos. 400 to 499 were squadrons of the Royal Canadian Air Force, Royal Australian Air Force and Royal New Zealand Air Force. Not all numbers were used and unfortunately there are no detailed information available.

Overview of RAF squadrons equipment and location:

The RAF squadron strength was between 6 and 18 aircrafts.