Gretaston
| Name | Gretaston |
| Type | Steamer
|
| GRT | 3,395 tons |
| Country |  British |
| Built | 1901
|
| Builder | W. Gray & Co., Ltd., West Hartlepool
|
| Operator | Gretaston SS. Co., Ltd. (W. S. Miller & Co.), Glasgow
|
| History |
|
U-boat attacks on Steamer Gretaston
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 15 Apr 1917 | UC 27 (Gerhard Schulz) | Sunk | Torpedoed and sunk off the Iberian coast.
| 43° 08'N, 11° 32'W
| Huelva - Garston
| copper ore
| 29
|
| Sunk with all hands and posted as missing. Attribution to UC 72 on April 30, 1917 incorrect.
|
Position of attack on Gretaston
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