Thorsdal
| Name | Thorsdal |
| Type | steamer |
| GRT | 2,200 tons |
| Country |  Norwegian |
| Built | 1890 |
| Builder | R. Thompson & Sons, Sunderland |
| Operator | A/S Thorsdal (J. Johanson & Co.), Christiania |
| History |
U-boat attacks on steamer Thorsdal
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 24 Jul 1917 | U 44 (Paul Wagenführ) | Sunk | off W coast of Scotland | 55° 35'N, 13° 38'W | Miramichi - Ardrossan | lumber | 0 |
Position of attack on Thorsdal
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