HMT Sapper
| Name | HMT Sapper |
| Type | Navy trawler
|
| GRT | 276 tons |
| Country |  British |
| Built | 1915
|
| Builder | Smith’s Dock Co., Ltd., Middlesbrough
|
| Operator | Royal Navy
|
| History |
|
U-boat attacks on Navy trawler Sapper
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 29 Dec 1917 | UC 71 (Ernst Steindorff) | Sunk | Mined near the Owers LV
| 50.37N, 0.41W
|
|
| 19
|
| Hit a mine laid on December 24, 1917 during the night with the explosion witnessed by two ships. No survivors.
|
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