The secondary armament consisted of four 10-inch guns mounted in four single-gun turrets positioned on each side of the superstructure.
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After World War I the battleship was sold to Chile as Almirante Latorre as originally intended.
Queen Mary mounted eight BL 13.5-inch Mk V guns in four twin hydraulically powered turrets, designated 'A', 'B', 'Q' and 'X' from bow to stern.