Wartenfels
| Name | Wartenfels |
| Type | Steamer
|
| GRT | 4,511 tons |
| Country |  British |
| Built | 1903
|
| Builder | J. C. Tecklenborg A.G., Geestemünde
|
| Operator | Admiralty requisition (Grahams & Co.), London
|
| History | A Deutsche Dampfs. Ges. “Hansa”, Bremen steamer that had been captured by British warships south of Aden on August 19, 1914.
|
U-boat attacks on Steamer Wartenfels
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 5 Feb 1917 | U 81 (Raimund Weisbach) | Sunk | 120 miles SW of Fastnet
| 50.10N, 11.59W
| Barry - Alexandria
| general cargo
| 2
|
| Master taken prisoner.
|
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