|Type||Fishing vessel (smack)|
|Operator||Alfred H. Lanfear, Ramsgate|
U-boat attacks on Fishing vessel (smack) Prudence
|1||2 Jun 1917||UB 23 (Hans Ewald Niemer)||Sunk||Stopped and sunk by gunnery 15 miles WSW of the Eddystone LH||0|
|Date given as the 3rd in British sources.|
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