Sirra
Sirra in 1914
| Name | Sirra |
| Type | Auxiliary motor |
| GRT | 223 tons |
| Country |  Dutch |
| Built | 1902 |
| Builder | A. Vuijk, Capelle a/d Ysel |
| Operator | Soetermeer, Fekkes & Co., Rotterdam |
| History | Steel-hulled three-masted schooner fitted with an auxiliary motor. |
U-boat attacks on Auxiliary motor Sirra
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 20 Jul 1917 | U 71 (Walter Gude) | Sunk | Stopped and shelled 70 miles NE of the north point of the Shetlands | Rotterdam - New York | in ballast |
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