On the outbreak of World War I she was assigned to the Ninth Cruiser Squadron operating in the Atlantic and in 1915 she was operating off Moudros, participating in the Dardanelles Campaign, for which she received the battle honour Dardanelles 1915.
On the outbreak of World War I she was assigned to the Ninth Cruiser Squadron operating in the Atlantic and was stationed off Cape Finisterre as flagship until June 1915. In 1915 she was operating off Moudros, participating in the Dardanelles Campaign, for which she received the battle honour Dardanelles 1915.