The Fritz-X Bomb was a guided glide bomb, developed by the company Ruhrstahl from 1938 to attack armored ships. It was first used in 1943, sinking the Italian battleship Roma. Had some other successes, but because of its short range and the fact of having to be guided by radio while the plane was watching the target, it enabled measurements of electronic warfare, and especially with defense fighters, become inefficient. Even so it was used on land, against bridges in the final months of the war.