Mary Orr
| Name | Mary Orr |
| Type | Sailing vessel
|
| GRT | 91 tons |
| Country |  British |
| Built | 1868
|
| Builder | Charles Connell & Co., Scotstoun
|
| Operator | Marwood & Co., Glasgow
|
| History |
|
U-boat attacks on Sailing vessel Mary Orr
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 10 Sep 1917 | UC 51 (Hans Galster) | Sunk | Stopped and sunk 8 miles NxE of Pendeen LH
| 50° 18'N, 5° 40'W
| Runcorn - Dieppe
| coal
| 0
|
| Mary Orr was the last vessel sunk by UC 51 on this date. Crew rescued by the U-boat and towed to that of Water Lily.
|
Position of attack on Mary Orr
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