Tres Fratres
| Name | Tres Fratres |
| Type | Trawler |
| GRT | 297 tons |
| Country |  Dutch |
| Built | 1906 |
| Builder | Goole SB. & Repg. Co., Ltd., Goole |
| Operator | NV Nederlandsche Stoomvaartmats (L. Groen), Ymuiden |
| History |
U-boat attacks on Trawler Tres Fratres
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Mar 1917 | U 62 (Ernst Hashagen) | Sunk | Stopped and scuttled in the North Sea | 57° 30'N, 6° 10'E | 0 |
Position of attack on Tres Fratres
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