Castilian
| Name | Castilian |
| Type | Steamer |
| GRT | 1,923 tons |
| Country |  British |
| Built | 1890 |
| Builder | W. Gray & Co., Ltd., West Hartlepool |
| Operator | Ellerman Lines, Ltd. (F. Swift), London |
| History |
U-boat attacks on Steamer Castilian
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 18 Apr 1917 | U 61 (Victor Dieckmann) | Sunk | 110 miles NWxN Tory Island | 56.20N, 10.45W | Liverpool - Genoa | general cargo | 10 |
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