 The British Gloster Gladiator and the Italian Fiat CR.42 biplane fighters were both still operational after 1939.The German Heinkel He 50 and the Soviet Polikarpov Po-2 were both used in the night ground attack role throughout the Second World War, with the latter soldiering on until the Korean War.The British Fleet Air Arm flew Fairey Swordfish torpedo bombers from its aircraft carriers in the anti-submarine warfare role until the end of the war because they could operate from the decks of small escort carriers.