Fritz-X

German air-to-ground guided bomb of World War II; its greatest success was the sinking of the Italian battleship Roma with three of these bombs 9 September 1943.

It was basically a standard 3,086 lb/1,400 kg armour-piercing bomb to which wings and a tail were added, together with a radio-control system. When dropped from an aircraft, the bomb went into a long glide during which the observer in the aircraft could steer it to its target.