Alesia
| Name | Alesia |
| Type | Passenger steamer |
| GRT | 6,006 tons |
| Country |  French |
| Built | 1902 |
| Builder | Bremer Vulkan, Vegesack |
| Operator | Cie. de Navigation Sud-Atlantique, Bordeaux |
| History | Built as Prinz Adalbert for Hamburg-Amerika Linie, Hamburg. Seized at Falmouth. Taken into Admiralty service as a commissioned repair ship and renamed Princetown. In 1915 returned to mercantile service with Gellatly, Hankey & Co. as managers. In 1917, transferred to Cie. de Navigation Sud-Atlantique and renamed Alesia. |
U-boat attacks on Passenger steamer Alesia
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 5 Sep 1917 | UC 69 (Hugo Thielmann) | Damaged | 40 miles NW of Ushant | Cardiff - Bordeaux | general cargo and coal | ||
| sunk next day by UC50 | ||||||||
| 2 | 6 Sep 1917 | UC 50 (Rudolf Seuffer) | Sunk | Torpedoed off Ushant | 48° 49'N, 5° 00'W | |||
| Torpedoed the previous day by UC 69 | ||||||||
Position of attack on Alesia
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