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.
HMS Ocean (R68) On 4 December 1945, a Sea Vampire flown by Eric "Winkle" Brown made the first ever carrier landing of a purely jet-powered aircraft onto Ocean (although earlier that year a composite jet and piston engined Ryan FR-1 Fireball had made a carrier landing under jet power after its radial engine failed.)[8] The last Fairey Swordfish to make an official flight from a Royal Navy aircraft carrier did so earlier in October 1945 from the deck of Ocean.[citation needed] When British forces withdrew from Palestine in 1948, Ocean supported the withdrawal.