 The ships also saw limited service in the Baltic Sea, primarily during the abortive Battle of the Gulf of Riga in August 1915.The first major operation of the war in which the "Helgoland"-class ships participated was the raid on Scarborough, Hartlepool and Whitby on 15–16 December 1914.The raid was primarily conducted by the battlecruisers of the I Scouting Group.