Yrsa
Photo courtesy of Danish Maritime Museum, Elsinore
| Name | Yrsa |
| Type | Steamer |
| GRT | 879 tons |
| Country |  Danish |
| Built | 1914 |
| Builder | Antwerp Engineering Co., Ltd., Hoboken |
| Operator | A/S Dampsk. Selsk. Vesterhavet (J. Lauritzen), Esbjerg |
| History |
U-boat attacks on Steamer Yrsa
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 3 Dec 1916 | UB 18 (Claus Lafrenz) | Sunk | 30 miles WNW of Guernsey | La Garrucha, Spain - London & Newcastle | lead & fruit | 0 |
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