On 13 June 1944 the first German V-1 flying bomb hit London. Allied countermeasures included equipping and training fighter units to intercept them. In July 1944 68 Squadron was re-equipped with a fighter version of the de Havilland Mosquito. Mansfeld shot down two V-1s: one over England on 27 July and the other over the North Sea on 24 October.
