"Defiants": R.A.F. Night Fighters -- Defiants on patrol ***** clouds. The Boulton Paul Defiant is a long-range two-seater and is one of the types that have proved successful as night fighters. Powered by the famous Rolls-Royce Merlin engine, it has an impressive speed. Its armament includes a specially designed power-operated multi gun *****. April 22, 1941. (Photo by British Official Photograph).