Siraa
| Name | Siraa |
| Type | Sailing vessel
|
| GRT | 1,938 tons |
| Country |  Norwegian |
| Built | 1887
|
| Builder | R. Williamson & Son, Workington
|
| Operator | A/S Christianssand (S. O. Stray & Co.), Kristiansand
|
| History | Steel and iron-hulled ship-rigged sailing vessel. Built as Boadicea.
|
U-boat attacks on Sailing vessel Siraa
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 30 Jun 1917 | U 155 (Karl Meusel) | Sunk | Stopped and searched off Punta Delgada. Sunk on June 30, 1917.
| 40° 22'N, 26° 51'W
| Buenos Aires – Le Havre
| quebracho
| 0
|
Position of attack on Siraa
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