In March 1915, as the British and French fleets waging the Dardanelles campaign were preparing to launch a major attack on 18 March, the overall commander, Admiral Sackville Carden, requested two more battleships of the 5th Squadron, "Implacable" and "Queen", to be transferred to his command in the expectation of losses in the coming operation. The Admiralty ordered the two ships to transfer to the Dardanelles, and they left England on 13 March 1915 and arrived at Lemnos on 23 March 1915. By the time they arrived, the British had lost two battleships in the 18 March attack, prompting the Admiralty to send the last two ships of the 5th Squadron to join the fleet. On her arrival off the Dardanelles, "Queen" joined 2nd Squadron, where she became the flagship of Rear Admiral Cecil Thursby. Over the course of the next month, the British and French fleet began preparations for the Landing at Cape Helles, the beginning of the land portion of the Gallipoli Campaign. She supported the ANZAC landings at Gaba Tepe on 25 April 1915. "Queen" arrived off the landing beach at about midnight, along with the battleships and ; they were tasked with supporting the landing of the 3rd Australian Brigade. "Queen" covered the right side of the beach. Over the course of the landing, "Queen" and the other covering ships provided covering fire as the ANZAC troops advanced inland and helped to suppress Ottoman artillery.