E11
| Built By: | Vickers (Barrow) |
| Build Group: | E Group 2 |
| Fate: | Sold for scrap in Malta in March 1921. |
Stoker 1st Class Henry Dench Mayne DSM (O/N 293347)
Henry Mayne was accidentally lost over board in the Mediterranean about 150 miles from Malta on 20th July 1915. E11's First Lieutenant, Lieutenant Guy D'Oyly-Hughes, jumped in to save him but Mayne was lost. D'Oyly-Hughes was awarded the Silver Medal of the Royal Humane Society in 1915 for his efforts to save Mayne.
Henry Dench Mayne DSM (O/N 293347) served as a submariner from 8th December 1906 to 22nd September 1908 and from 14th November 1911 to 25th July 1915 in Submarines E9 & E11. He served in E11 at the Dardanelles and was on board for that Submarine's first patrol in the Sea of Marmora and he was awarded the DSM.
Henry Mayne was born in Fishbourne in Sussex and he was the son of Henry and Elizabeth Mayne. He was the thirty nine year old husband of Elizabeth Jane Mayne of Ingleside Cottage, Old Fishbourne, Chichester, Sussex.
Henry Mayne is commemorated on the Portsmouth Naval War Memorial on Panel No. 8.
Roll of Honour
| Name | Rank | Number | Hons | Age |
| Hodder, Albert George | Petty Officer 1st Class | 36 | ||
| Reported to have died in an accident on 04/021915. | ||||
| Mayne, Henry Dench | Stoker | 293347 | DSM | |
| Accidentally lost over board in the Mediterranean about 150 miles from Malta on 20/07/1915 | ||||
Events
| 13-07-1912 : | Laid Down |
| 23-04-1914 : | Launched |
| 19-09-1914 : | Completed |
| 18-05-1915 : | E11, commanded by Lt-Cmdr Martin Nasmith passed through the Dardanelles on the night of 18 May. Surfacing off the town of Gallipoli, Nasmith captured a Turkish sailing vessel and lashed it to the conning tower to act as a disguise. This ruse failed to attract any targets, so after several days he abandoned it. |
| 23-05-1915 : | Travelling up the Sea of Marmara, Ell sank a gunboat and several other small craft. |
| 24-05-1915 : | Travelling up the Sea of Marmara, E11 sank two Turkish transport ships and drove another agound. |
| 26-05-1915 : | A torpedo from E11 struck the transport ship Stamboul and E11 dived to escape from shore-based artillery. This had been the first attack at Constantinople by an enemy vessel in more than 100 years. The Ell attack caused a major panic in the city. |
| 08-07-1915 : | E11 torpedoed the antiquated Turkish battleship Hirredin Barbarosa off Bulair at the northern entrance to the Dardanelles. |
| 20-07-1915 : | E11 moved into the Gulf of Izmir and during the night the submarine's first officer, Lt Guy D'Oyly-Hughes, swam ashore and blew up a section of the Constantinople to Baghdad railway line, a feat for which he was awarded the Distinguished Service Order. |
| 20-07-1915 : | Stoker Henry Mayne was accidentally lost over board in the Mediterranean about 150 miles from Malta. E11's First Lieutenant, Lieutenant Guy D'Oyly-Hughes, jumped in to save him but Mayne was lost. D'Oyly-Hughes was awarded the Silver Medal of the Royal Humane Society in 1915 for his efforts to save Mayne. |
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