|Builder||Smith’s Dock Co., Ltd., Middlesbrough|
U-boat attacks on Navy trawler Sapper
|1||29 Dec 1917||UC 71 (Ernst Steindorff)||Sunk||Mined near the Owers LV||50° 37'N, 0° 41'W||19|
|Hit a mine laid on December 24, 1917 during the night with the explosion witnessed by two ships. No survivors.|
Position of attack on Sapper
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