 Their main armament consisted of four breech @-@ loading ( BL ) 13 @.@ 5 @-@ inch ( 343 mm ) guns mounted in two twin @-@ gun barbettes , one each fore and aft of the superstructure . Each gun was provided with 80 rounds . Their secondary armament consisted of ten quick @-@ firing ( QF ) 6 @-@ inch ( 152 mm ) guns . 200 rounds per gun were carried by the ships . Sixteen QF 6 @-@ pounder ( 2 @.@ 2 in ( 57 mm ) ) and a dozen QF 3 @-@ pounder ( 1 @.@ 9 in ( 47 mm ) ) Hotchkiss guns were fitted for defence against torpedo boats . The two 3 @-@ pounders in the upper fighting top were removed in 1903 – 04 and all of the remaining light guns from the lower fighting tops and main deck followed in 1905 – 09 . The Royal Sovereign @-@ class ships mounted seven 14 @-@ inch ( 356 mm ) torpedo tubes , although Empress of India had four of hers removed in 1902 . 
