Yvonne
| Name | Yvonne |
| Type | Sailing vessel
|
| GRT | 87 tons |
| Country |  French |
| Built | 1905
|
| Builder | Bonne, Kerity
|
| Operator | Alexis Geffroy, Jean Péron, and Yves Le Troquer.
|
| History | Dandy. Built as Ouoloff.
|
U-boat attacks on Sailing vessel Yvonne
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 31 Jan 1917 | U 55 (Wilhelm Werner) | Sunk | off Pendeen
|
| Lannion - Cardiff
|
| 4
|
| Master Alexis Geffroy. Sailed from Lannion on January 20th and never arrived in Cardiff; vessel posted as missing. U 55 stopped and sank by gunnery an unidentified sailing vessel off Pendeen on the evening of January 31st of an estimated 80 grt but didn’t determine it’s exact identity.
|
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