When war broke out in the Pacific, the Japanese naval air force had the
world's most advanced Nakajima B5N2 torpedo-bomber aircraft, which was
far superior to the American Douglas TBD-1 Devastator and a generation
ahead of the British Fairey Swordfish biplanes. The Japanese aircraft
were faster, more maneuverable, and could drop torpedoes from a higher
altitude. After a successful debut over Pearl Harbor, these machines
were involved in every major naval battle until 1944, making a permanent
mark on aviation history. It was not until 1943/1944 that this superb
aircraft began to be replaced by the modern Nakajima B6N Tenzan. The
road to the creation of B5N was not easy and was fraught with many
failures.