 The forward conning tower had walls thick; those of the aft conning tower were thick.During World War I, a pair of 50-caliber 76-millimeter guns on high-angle mounts were fitted as anti-aircraft (AA) guns, one gun at the bow and the other on top of 'X' turret.In 1925 the number of low-angle 50-caliber 76-millimeter guns was reduced to 13, all mounted on the turret tops, and six new 40-caliber 76-millimeter guns were installed abreast the aft funnel.