Carnarvon captured the German merchant ship SS Professor Woermann on 23 August 1914 after moving to Cape Verde at the beginning of that month. She moved to Montevideo in October 1914 and later led cruisers at the Battle of the Falkland Islands on 8 December 1914. In March 1915, after repairs were completed at Rio de Janeiro for tears to her plating, she continued to serve on the North American and West Indies Station until November 1918. In 1919 she served as a cadets' training ship until sold in March 1921 and broken up on 8 November 1921.