The tower-keep had a modest entrance, which was reached by a draw-bridge that lay across the surrounding moat, which initially reached right up to the base of the castle. A simple, 12-foot (3.6 m) high bailey wall, with minimal defensive value, surrounded the moat, which was in contrast wide, 10-foot (3 m) deep, and would have been difficult for an attacker to drain. On the east side of the castle Nunney Brook was used as a line of defence rather than a bailey wall.