Iolanthe
| Name | Iolanthe |
| Type | Steamer
|
| GRT | 3,081 tons |
| Country |  British |
| Built | 1904
|
| Builder | W. Gray & Co., Ltd., West Hartlepool
|
| Operator | London Marine Steamship Co., Ltd. (Petersen & Co., Ltd.), London
|
| History |
|
U-boat attacks on Steamer Iolanthe
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 5 Jan 1918 | UC 75 (Johannes Lohs) | Sunk | 10 miles SExE of Portland Bill
| 50° 28'N, 2° 12'W
| Clyde - St. Helen’s Roads
| hay & trucks
| 0
|
| Or late on January 4. Capt. Thomas Richmond Chief Off.
|
Position of attack on Iolanthe
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