Proba
| Name | Proba |
| Type | Sailing vessel |
| GRT | 105 tons |
| Country |  British |
| Built | 1891 |
| Builder | C. Gent, Plymouth |
| Operator | J. G. Harris, Dartmouth |
| History | Wooden schooner |
U-boat attacks on Sailing vessel Proba
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 7 Dec 1917 | UB 55 (Ralph Wenninger) | Sunk | Stopped and scuttled 3 miles SE of Cape Lizard | 49.56N, 05.08W | Swansea - Cherbourg | coal | 0 |
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