Originally the middle bailey was defended by a curtain wall on a high earth bank running up from Peverell’s gate in the western outer curtain around in a long sweep to Ashford Tower in the east outer curtain, with a southward loop around the church of St. Mary-in-Castro. These works, including Coltons gate, are assumed to be part King John's phase of works (1199-1216). Little of this now survives apart from Coltons Gate, part of the wall running north and west of the gate and some of the earthworks. (location accurate to the nearest 1m based on available information)