The ship was armed with a battery of four muzzle-loading Armstrong guns mounted in a central, armored casemate, two guns per side. The guns were positioned so as to allow any two to fire directly ahead, astern, or to either broadside. The casemate had heavy armor protection, with the gun battery protected by 222 mm of iron plating. The upper section of the casemate had thinner armor, at thick. The hull had a complete armored belt at the waterline, which extended .6 m (2 ft) above the line and 1.2 m (4 ft) below. The above-water portion was 222 mm thick, while the submerged part was 150 mm thick.