Countess Of Mar
| Name | Countess Of Mar |
| Type | Steamer
|
| GRT | 2,234 tons |
| Country |  British |
| Built | 1916
|
| Builder | Forth SB. & Engineering Co., Ltd., Alloa
|
| Operator | Gascony SS. Co., Ltd. (L. Walford (London), Ltd.), London
|
| History |
|
U-boat attacks on Steamer Countess Of Mar
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 4 Aug 1917 | U 61 (Victor Dieckmann) | Sunk | 55 miles N1/4E of Bayonne
| 44° 27'N, 1° 48'W
| Bilbao - Cardiff
| ore
| 20
|
Position of attack on Countess Of Mar
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