A B-17 Flying Fortress of the 303rd Bomb Group flies over Brest whilst bombing a U-boat base. Image stamped on reverse: 'Passed for publication 16 March 1943.' [stamp] Printed caption on reverse: 'BRITISH OFFICIAL PHOTOGRAPH: (AIR MINISTRY) Crown Copyright Reserved. C.3450. (Picture issued 1943) U.S. Fortress over Brest - much bombed Atlantic U-Boat Base. Picture shows: A Flying Fortress of U.S. Bomber Command over Brest. Brest is one of the principal German U-boat bases on the French Atlantic coast, and has frequently been the target for heavy bombers of the U.S. Army Eighth Air Force. '