I'll bite.
22 September 1914.
U-9 sinks armoured cruisers
Aboukir,
Hogue and
Cressy off the Broad Fourteens. After this ships would no longer attempt to rescue survivors if a submarine attack was suspected.
1 January 1915.
U-24 sinks battleship
HMS Formidable off the Devon coast becoming the first British battleship sunk by a U-Boat. Events following the sinking contributed to the 1940 novel
Lassie Come Home.
27 May 1915.
U-21 commanded by KL Hersing torpedoes his second battleship,
HMS Majestic off Gallipoli becoming the first U-Boat commander to sink two battleships. Two days earlier
U-21 had sank the battleship
HMS Swiftsure
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Correction thanks to Neal, U-21's first battleship victim was Swiftsure's sister Triumph. My error.
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