The Dornier Do 335 Pfeil was a World War II German fighter aircraft which was fielded by the Luftwaffe from 1944. The Pfeil had a unique design in which one engine was fixed forward in the nose, and the other was fitted aft, behind the tail. It was designed by Claudius Dornier in 1937 and was manufactured by the Dornier Flugzeugwerke. The Do 335 flew for the first time in October 1943 and entered active service in November 1944. During the test flights, it performed very well, showing no structural defects. Although it was fast and maneuverable, this radical fighter was delivered too late and too few to alter the outcome of the war. Only 38 units were produced.