"The Royal Flying Corps on the Western Front, 1914-1918" Re-assembling aeroplanes at No. 1 Aircraft Depot at St. Omer, 19 December 1917. That on the right is a Bristol Fighter (probably of No. 11 Squadron RFC) presented by the Gold Coast. That on the left is an Royal Aircraft Factory S.E.5 single-seat fighter biplane. The engines of both are being tested.