|Laid down:||1 June 1912|
|Commissioned:||18 June 1914|
|Fate:||Scuttled, 3 April 1918|
|Class and type:||E class submarine|
|Length:||181 ft (55 m)|
|Beam:||15 ft (4.6 m)|
At dawn on 13 September 1914, the submarine, commanded by Lieutenant-Commander Horton, torpedoed the German light cruiser SMS Hela six miles southwest of Heligoland. Hela was hit amidships with the two torpedoes, fired from a range of 600 yards. All but two of her crew were rescued by the German submarine U-18 and another German ship. Although pursued most of the day by German naval forces, E9 managed to reach Harwich safely. Three weeks later, Horton sank the German destroyer S 116 off the mouth of the River Ems. For sinking the cruiser and the destroyer, Horton was awarded the Distinguished Service Order (DSO).
HMS E9 was salvaged for breaking in Finland in August 1953.
- "Admiral Sir Max Kennedy Horton, RN". uboat.net. Retrieved 2006-11-26.
- Submarines, war beneath the waves, from 1776 to the present day, by Robert Hutchinson
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