Master plan: front shot of Lancaster taking off, passing very low over camera. Several shots of Lancaster in air, of Lancasters on ground from various distances. Night shots of Lancasters on ground. Various shots of personnel carrying out various duties on ground including folding parachutes, tending to pigeons. Sequence on crews boarding plane at night, bombers taking off, airborne. AERIAL SHOTs over enemy city at night, flashes from bombs.