"Triumph"s secondary armament consisted of fourteen 50-calibre long BL 7.5-inch Mk IV guns. Ten of the guns were mounted in a central battery on the main deck; the other four were in casemates abreast the fore- and mainmasts on the upper deck. A major problem with the guns on the main deck was that they were mounted low in the ship—only about above water at deep load—and were unusable at high speed or in heavy weather as they dipped their muzzles in the sea when rolling more than 14°. The guns fired projectiles at a muzzle velocity of at a rate of four rounds per minutes. At their maximum elevation of 15° they had a maximum range of about . The ship carried 150 rounds per gun.