Tres Macs
| Name | Tres Macs |
| Type | Auxiliary motor
|
| GRT | 163 tons |
| Country |  Portuguese |
| Built | 1905
|
| Builder | H. Parry & Sons, Lisbon
|
| Operator | Vacuum Oil Co. (J. M. da Silva Teillas), Lisbon
|
| History | Sailing vessel fitted with an auxiliary motor
|
U-boat attacks on Auxiliary motor Tres Macs
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 14 Apr 1917 | U 52 (Hans Walther) | Sunk | Stopped and sunk by gunnery between Gibraltar and Cape St. Vincent
| 36° 39'N, 7° 22'W
|
| gasoline
|
|
Position of attack on Tres Macs
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