The last generation of biplane fighters (like the Gloster Gladiator and Polikarpov I-15) that had been placed in service during that decade could not catch the privately created Bristol Type 142 twin-engined light bomber prototype in 1935. However by the end of the 1930s, low-wing monoplane fighters like the Hawker Hurricane and the Supermarine Spitfire had entered service, and they had the performance to catch up with the Schnellbomber, and dramatically outgun it by eight to one (only one gun would normally be able to fire back). The Do 17 suffered badly at the hands of the RAF during the Battle of Britain, and its production run ended in 1940.