Umberto I
| Name | Umberto I |
| Type | Armed merchant cruiser
|
| GRT | 2,766 tons |
| Country |  Italian |
| Built | 1878
|
| Builder | A. McMillan & Son, Dumbarton
|
| Operator | Royal Italian Navy
|
| History | Peace-time operator: Comm. G. Orlando, Livorno
|
U-boat attacks on Armed merchant cruiser Umberto I
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 14 Aug 1917 | UC 35 (Hans Paul Korsch) | Sunk | Torpedoed off Gallinara Island
| 44° 04'N, 8° 15'E
|
|
| 26
|
| or 2889 tons
|
Position of attack on Umberto I
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