the inner ward is approximately across, protected by a deep, revetted, water-filled moat, dug out of the rock. the curtain wall has four circular, four-storey towers and a gatehouse, with domestic buildings reaching around the insides of the defences. the four-storey gatehouse is flanked by two circular towers and would originally have had a portcullis and a drawbridge. it would originally have been used by the castle's constable or steward. stretching eastwards from the gatehouse are the castle's hall, the constable's living quarters, the chapel – partially contained in one of the towers- the remains of the earlier keep, service buildings and the kitchen block. only the foundations of these buildings survive. a postern gate in the inner ward leads through to the southern hornwork, which would originally have been linked by a wooden bridge, protected by timber defences and towers, with later stone additions, of which only traces remain.