 The moat is about deep and wide and is crossed by a fixed modern steel bridge that replaced the original wooden sliding drawbridge that leads to the gatehouse.The scarp or inner wall of the moat rises above the height of the platform to serve as a parapet with musketry loopholes, except at the salient angles of the bastions to allow the guns mounted on the bastions' platform to fire over the parapet.All but the southwestern bastion still have some gun mountings remaining.