Hercules
| Name | Hercules |
| Type | Steamer |
| GRT | 1,095 tons |
| Country |  British |
| Built | 1881 |
| Builder | Whitehaven SB. Co., Ltd., Whitehaven |
| Operator | Admiralty requisition (Everett & Newbigin), London |
| History |
U-boat attacks on Steamer Hercules
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 25 Mar 1918 | UB 21 (Walter Scheffler) | Sunk | 4 miles NNW of Flamborough Head | London - Tyne | in ballast | 1 |
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