Constructed mostly of wood, the twin-engine de Havilland Mosquito was conceived as a bomber and became one of the war's most potent fighters built between 1939 and 1945. It excelled in all the widely varied roles. Its duties included the duties of low-level and high-attack day and night bomber, long-range photo-reconnaissance, mine layer, pathfinder, high-speed military transport, long-range day and night fighter, and fighter-bomber. It served in Europe, the Middle and Far east and on the Russian front. A total of 7,781 Mosquitos were built with 6,710 delivered during the war.