Siena
| Name | Siena |
| Type | Passenger steamer
|
| GRT | 4,372 tons |
| Country |  Italian |
| Built | 1905
|
| Builder | N. Odero fu A. & Co., Sestri Ponente
|
| Operator | La Veloce Nav. Italiana, Genoa
|
| History |
|
U-boat attacks on Passenger steamer Siena
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 4 Aug 1916 | U 35 (Lothar von Arnauld de la Perière) | Sunk | Captured and sunk by gunfire 20 miles SW of Planier Island at 11:30am
| 42° 55'N, 5° 10'E
| Colon - Genoa
|
| 46
|
Position of attack on Siena
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