E1 was launched on the 9th November 1912, and commissioned on the 6th May 1913. When war broke out, she was attached to the 8th Flotilla at Harwich, and on the 15th October 1914, she sailed from Harwich  with E9 and E11  with orders to make their way to the Baltic to find and attack German warships. In company with her sister-boat, she scouted the entrance to the Baltic Sea as a prelude to sending a submarine force to penetrate the German defences and operate in the Baltic. E1 was the first submarine of a class of fifty seven submarines which formed the backbone of the British submarine fleet throughout the First World War and of which twenty nine were lost. E1 was one of five boats to penetrate The Baltic when she damaged the German battle cruiser Moltke on 19 August 1915. E1 was eventually scuttled at Hesingfors to prevent her into falling into the hands of the Bolsheviks. In April 1918, German forces successfully intervened in the Finnish Civil War. This left the Royal Navy’s Baltic Sea Submarine force in an untenable position, so the majority of British submarines in the area were scuttled to prevent their capture by the Germans. E1 was scuttled by her crew  on 3rd April 1918 off Helsinki.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/59759366@N02">Harwich &amp; Dovercourt</a> from Dovercourt, United Kingdom
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/harwichs/5722267100/">E01</a>