HMS Triumph
HMS Triumph’s sister ship HMS Swiftsure
| Name | HMS Triumph |
| Type | Battleship |
| GRT | 11,985 tons (one of the largest ships hit) |
| Country |  British |
| Built | 1903 |
| Builder | Vickers, Barrow |
| Operator | Royal Navy |
| History | Only two days later the same submarine would sink another British battleship, the HMS Majestic. |
U-boat attacks on Battleship Triumph
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 25 May 1915 | U 21 (Otto Hersing) | Sunk | W of Cape Helles, Gallipoli | 73 |
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