The ship was protected with Krupp cemented armor plate. Her armor belt covered the side of the hull from above the waterline and below. The main section of belt, between the barbettes for the 254 mm guns, was thick, tapering to at the top edge and at the bottom. Forward of the main section, the belt was reduced to 102 mm with a bottom edge, while aft, the belt was a uniform thickness of 76 mm. The aft section did not extend all the way to the sternpost, instead terminating at a 76 mm transverse bulkhead. Above the belt, a strake of armor that was 76 mm thick covered the tertiary casemates. There were three armored decks; the lower deck was thick, with sloped sides that were and connected to the bottom edge of the belt. The main deck was also 38 mm thick, and above that, the roof of the casemate battery was 25 mm.
