AIR TO AIR SHOTs of Flying Fortresses on way to target. Sequence on air battle between escorts and enemy defenders with several CUs of guns firing. Planes sweeping by. Shots of explosions as planes blow up. Intercuts to interior shots of bombers. Bomb aimers at work, German antiaircraft batteries firing, bombers falling, bombs being released as seen from open bay of camera plane and from neighbouring aircraft. AERIAL SHOTs of bomb bursts, smoke.