 The ship was initially assigned to the Atlantic Fleet upon completion in 1911, but was reduced to reserve in mid-1913.When the First World War began in 1914, "Falmouth" was transferred to the 1st Light Cruiser Squadron (LCS) of the Grand Fleet and then the 3rd Light Cruiser Squadron at the end of the year.The ship participated in most of the early fleet actions, including the Battles of Heligoland Bight, Dogger Bank, and Jutland, but was only seriously engaged in the latter.