After the Dardanelles campaign ended with the evacuation of Allied forces from Gallipoli in January 1916, "Canopus" was assigned to the British Eastern Mediterranean Squadron, where she served until she returned to the United Kingdom in April 1916. "Canopus" arrived at Plymouth on 22 April 1916, then paid off at Chatham to provide crews for antisubmarine vessels. She remained at Chatham until April 1916, undergoing a refit there later in 1916, having her eight main-deck 6-inch (152 mm) guns replaced by four on the battery deck and her 12-pounder and 3-pounder guns replaced by light antiaircraft weapons in 1917, and becoming an accommodation ship in February 1918. "Canopus" was placed on the disposal list at Chatham in April 1919. She was sold for scrapping on 18 February 1920 and arrived at Dover on 26 February 1920 to be scrapped.