A Balloon Site, Coventry

Members of the Women's Auxiliary Air Force hauling in a kite balloon at a coastal site.

From March 1939, Coventry had been protected by barrage balloons; the city was an industrial target and contained aircraft factories on the outskirts. The balloons were filled with hydrogen and were either set in fixed sites, or adapted for mobile deployment. They were fixed by steel cables which forced bombers to fly at a higher altitude than they would have preferred. In this way the bombing was less accurate, and the aeroplanes more vulnerable to ground-based anti-aircraft fire.[1][2][3] The protection was not infallible, and, on 14 November 1940 Coventry was the target of a German bombing raid when over 10,000 incendiary bombs were dropped on the city.[4] From April 1941 women were used to operate the balloons, a crew of fourteen women replacing the ten men that do so previously.[1]

During the Second World War the British government formed the War Artists' Advisory Committee (WAAC) under the chairmanship of Sir Kenneth Clark, the director of the National Gallery. The committee was "to draw up a list of artists qualified to record the war at home and abroad".[5] One of those commissioned on several occasions was the British painter Laura Knight, who had painted for the Canadian government during the First World War.[6] By early 1942 she had painted four pictures for the WAAF; the most recent was In for Repairs, showing members of the Women's Auxiliary Air Force (WAAF) repairing a damaged barrage balloon. The Air Ministry was impressed with the picture and its potential to help with recruiting. The Ministry asked the WAAF if Knight could be commissioned again,[7] and, in October 1941, she received a request from Mr Dickey, the Secretary of the WAAC, to paint members of the Women's Auxiliary Air Force based at RAF Wythall—the regional headquarters of RAF Balloon Command—which was six miles (ten kilometres) from Birmingham. She worked on the piece in July and August 1942,[8] and was paid 100 guineas for the work.[9]

A Balloon Site was displayed at the 1943 Royal Academy Summer Exhibition, as was Ruby Loftus Screwing a Breech Ring, a painting Knight had just completed. Both works were warmly received.[8] As at 2021, the painting is held by the Imperial War Museum.[1]

A Balloon Site is an oil painting on canvas measuring 102.5 by 127 centimetres (3.36 ft × 4.17 ft). It shows the launch of a barrage ballon on the outskirts of Coventry. In the middle distance are several damaged buildings,[10] and the partial ruins of Coventry shown in the background.[9] In the foreground two groups work on launching the balloon. The group in the foreground—composed of three women and man—are under the leadership of Jean Brydon, a female sergeant. A second group are shown on the far side of the balloon.[10][11][12]

According to the art historians Teresa Grimes, Judith Collins and Oriana Baddeley, A Balloon Site and In For Repairs "are about activity, the concentration and absorption in work generated by a group endeavour are central to their composition".[13]