HMS E19 was built by Vickers, Barrow-in-Furness, and launched on the 13 May 1915. During World War I she was part of the British submarine flotilla in the Baltic. Under the command of Lt Cdr Francis Cromie (subsequently murdered by Bolsheviks in Petrograd in 1918), E19 was able to sink several German ships, most notably on the 11 October 1915 when she sank 4 German transport ships, just south of Öland, within a few hours and without any casualties. On 7 November 1915 E19 sank the German light cruiser SMS Undine. E19 was scuttled by her crew outside Helsinki 1.5nm south of Harmaja Light, Gulf of Finland, along with E1, E8, E9, C26, C27, and C35 to avoid seizure by advancing German forces who had landed nearby.