Alf
| Name | Alf |
| Type | Sailing vessel |
| GRT | 196 tons |
| Country |  Danish |
| Built | 1903 |
| Builder | J. Boas, Rudkjøbing |
| Operator | Alfred Nielsen, Rudkjøbing |
| History | Wooden three-masted schooner. |
U-boat attacks on Sailing vessel Alf
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Oct 1916 | UB 23 (Ernst Voigt) | Sunk | W of L’Orient | 47° 35'N, 4° 02'W | Liverpool - Rochefort | pitch | 0 |
Position of attack on Alf
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