The forward conning tower had a roof that was thick; the sides were 30 cm thick. Atop the conning tower was the smaller gunnery control tower, which had a curved face that was thick. The aft conning tower was less well protected, with a thick roof and sides. The main battery turrets had 28 cm thick faces, sides, and rear plates to balance the turrets. Their roofs consisted of two parts: a sloped front section that was 9 cm and a flat rear section that was thick. The casemated secondary battery was protected by the upper belt and had 8 cm thick gun shields; each gun was divided by a 2 cm transverse screen to prevent shell fragments that might hit one gun from entering the adjacent casemate. The ships were also fitted with anti-torpedo nets, but these were removed after 1916.