Dag
| Name | Dag |
| Type | Steamer |
| GRT | 963 tons |
| Country |  Norwegian |
| Built | 1882 |
| Builder | J. Elder & Co., Glasgow |
| Operator | A/S Dag (Bachke & Co.), Trondheim |
| History |
U-boat attacks on Steamer Dag
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 25 Oct 1916 | U 56 (Hermann Lorenz) | Sunk | 3 miles off Berlevaag | Arkhangelsk - King’s Lynn | lumber | 0 |
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