The oval inner bailey was formed by scarping and counter-scarping the natural contours of the hill, producing a bank, now largely destroyed, and a protective ditch. The early 13th-century curtain wall is mostly of roughly dressed, coursed stone, up to thick and high, with two sections repaired with ashlar facings. The wall was defended by six mural towers along its southern and western sides, of which three still survive reasonably intact, and strengthened with pilaster buttresses along the northern edge. The bases of the walls and the towers were splayed, spreading their weight out more broadly, but their footings are only deep in places. A barbican protected the link from the drawbridge to the gatehouse of the inner bailey, complete with an additional corner turret. The remains of the collapse of the curtain wall are still visible in the ditch.