 The ship's main battery consisted of four 12-inch (305 mm) guns mounted in two twin gun turrets, one forward and one aft. The secondary battery consisted of fourteen 6-inch (152 mm) quick-firing guns, mounted in casemates on the sides of the hull and in the superstructure. A number of smaller guns were carried for defence against torpedo boats. These included 20 QF 12-pounder 12 cwt guns, eight 47-millimetre (1.9 in) 3-pounder guns and ten 37-millimetre (1.5 in) 2.5-pounder Hotchkiss guns. She was also armed with four submerged 18-inch torpedo tubes. Hatsuse's waterline armour belt consisted of Harvey armour and was 4 – 9 inches (102 – 229 mm) thick. The armour of her gun turrets had a maximum thickness of 10 in (254 mm) and her deck ranged from 2.5 to 4 inches (64 to 102 mm) in thickness.
