Given their limited displacement, the Indiana class had formidable armament for the time: four 13-inch guns, an intermediate battery of eight 8-inch guns and a secondary battery of four 6-inch guns, twenty Hotchkiss 6-pounders, and six Maxim-Nordenfelt 1-pounders, as well as six 18-inch Whitehead torpedo tubes.
The eight 8-inch guns were mounted in pairs in four wing turrets placed on the superstructure.