Trewyn
| Name | Trewyn |
| Type | Steamer |
| GRT | 3,084 tons |
| Country |  British |
| Built | 1903 |
| Builder | J. Readhead & Sons, So. Shields |
| Operator | Hain Steamship Co., Ltd. (E. Hain & Son), St. Ives |
| History |
U-boat attacks on Steamer Trewyn
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 30 Mar 1916 | U 28 (Georg-Günther von Forstner) | Sunk | Torpedoed and sunk W of Ushant. Had passed Gibraltar on March 25 and not heard from again. Posted as missing. | 47° 30'N, 7° 30'W | Algiers - Middlesbrough | iron ore | 23 |
| The steamer Governor reported that on April 3, 1916 she had observed a life buoy marked TREWYN, ST. IVES and several awning spars painted white, 80 miles W.S.W. of Ushant.
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Position of attack on Trewyn
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