Cyrus
| Name | Cyrus |
| Type | Sailing vessel |
| GRT | 293 tons |
| Country |  Russian |
| Built | 1894 |
| Builder | C. Muzneck, Windau |
| Operator | Martinson & Co., Windau |
| History | Wooden three-masted schooner. |
U-boat attacks on Sailing vessel Cyrus
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 16 Jul 1917 | U 30 (Franz Grünert) | Sunk | Torpedoed W of the Hebrides | 57° 53'N, 10° 35'W | Liverpool - Reykjavik | coal |
Position of attack on Cyrus
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