when were submarines first used in world war 1
U-boat On 5 September 1914, HMS Pathfinder was sunk by SM U-21, the first ship to have been sunk by a submarine using a self-propelled torpedo. On 22 September, U-9 sank the obsolete British warships HMS Aboukir, HMS Cressy and HMS Hogue (the "Live Bait Squadron") in a single hour.
List of U-boats of Germany In the World War II era, Germany commissioned some 1,250 U-boats into the Kriegsmarine.