"Cochrane" was transferred to the North America and West Indies station in November 1917, but rejoined the 2nd Cruiser Squadron early in 1918. She was based in Murmansk between March and September 1918 during the Allied intervention in the Russian Civil War. She ferried Soviet troops to Pechenga on 3 May to forestall an attempt by White Finns to seize the town. On 14 November 1918 she was stranded in the Mersey Estuary, while under the control of the pilot, and later broke in two, becoming a total loss. The wreck had been broken up in situ by June 1919.