The French ships began to retreat, but "Canopus" and the other British battleships continued the bombardment. Shortly thereafter, "Inflexible" struck a mine and was badly damaged but managed to withdraw. The battleships "Irresistible" and also struck mines and both sank, forcing the British to break off the attack. After that attack, "Canopus" and protected cruiser escorted the damaged "Inflexible" from Mudros to Malta on 6 April. In heavy weather and with "Inflexible" nearly foundering, "Canopus" had to take the crippled battlecruiser under tow, stern first, during the last six hours of the voyage on 10 April. Returning to the Dardanelles, "Canopus" took part in the blockade of Smyrna and covered a diversionary attack on Bulair during the main landings on 25 April 1915. She supported Anzac forces ashore in May, including during a strong Ottoman counterattack on 19 May. When her sister ship "Albion" became stranded on a sandbank off Gaba Tepe under heavy fire on 22–23 May 1915, "Canopus" towed her free. On 25 May, "Canopus" withdrew to Mudros and while leaving the Dardanelles, encountered the German U-boat "U-21", which went on to sink the battleship later that day. "Canopus" then underwent a refit at Malta from May to June 1915.