 The armour scheme of "Anson" and "Camperdown" was virtually identical to that of "Collingwood", although the thickness of the armour plate on the barbettes was increased as was the length of the waterline armour belt.To accommodate these changes without an increase in draught, these later two ships were lengthened by , and had their beam increased by 6 inches over their earlier sisters.The compound armour belt extended across the middle of the ships between the rear of each barbette for a length of .