Alert
| Name | Alert |
| Type | Sailing vessel |
| GRT | 59 tons |
| Country |  British |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Sailing vessel Alert
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 31 May 1918 | UB 40 (Hans Joachim Emsmann) | Sunk | 6 miles NE of Boulmer (Coquet area) | ||||
| Boulogne sur Mer ? | ||||||||
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