Trelyon
| Name | Trelyon |
| Type | Steamer
|
| GRT | 3,099 tons |
| Country |  British |
| Built | 1898
|
| Builder | J. Readhead & Sons, So. Shields
|
| Operator | Hain SS. Co., Ltd. (E. Hain & Son), St. Ives
|
| History |
|
U-boat attacks on Steamer Trelyon
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 20 Jul 1917 | UB 21 (Franz Walther) | Sunk | Mined 3 miles N Scarborough. Beached but a total loss.
| 54° 18'N, 0° 20'W
| Archangelsk - U.K.
| timber
| 0
|
| July 21 per British sources.
|
Position of attack on Trelyon
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