The Coleman Tower straddles the Outer and Inner Wards, and would have served as a defence against intruders trying to make it into the inner sanctum of the castle. It was built around the end of the 12th century. The tower is a squat, square building, and in 1323 records show that it was being used as a prison. The tower was remodelled after this time, and a parapet was built onto the top floor. The Coleman tower would have originally butted onto the Grayss Chamber…another fortified building that would have held sway over the drawbridge across the deep ditch separating Outer and Inner Wards.
Rosamund’s Tower, at the far North Eastern part of the castle, protected the curtain wall where it met the Inner and Outer Wards….with line of site into both parts of the castle’s grounds. The upper portion of the tower was probably built for accommodation, with a room for lowering and raising the drawbridge from the postern in the lower floor of the tower. A nearby turret would have given defenders good line of site over anyone looking at breaching the postern. The outer door, leading into the Outer Ward has a set of impressively deep draw bar slots for securing the doors. The postern can be accessed from the walk that now encircles the castle.
The gatehouse, in the Southern wall of the Outer Ward, has been virtually demolished. All that remains is the external brickwork minus most of the building beyond the curtain wall. A double door would have been hung from the jambs here, with a draw bridge over the shallow ditch. The archway that the double doors occupied can be seen when looking back at the gatehouse from the Outer Ward, now bricked up and only just visible. Some timbers are also embedded within the stonework, probably from later building periods. A barbican would have extended beyond the curtain walls, affording the castle’s occupants good lines of site for firing on any would be attackers.
The Diate Hill tower stands on the West portion of the Outer Ward’s curtain wall. It is positioned so that it straddles the curtain wall, thereby giving the castle’s occupiers a good view of the curtain wall at a point where it turns gradually West. The 6 metre square tower is fully accessible (except for the second and third floors) A good set of draw bar slots can be seen on the internal door jambs, providing good security against unwanted visitors. The wooden access stair and balcony have been recreated to enable access to the first floor. Good views of the outer walls of this tower can be seen from the walk that circles the outside of the castle.
This view of Rosamund's Tower demonstrates where the Outer Ward meets the Inner Ward. There is a door in the bottom of the ditch (out of shot here) which connects with the postern in the outer wall of the tower. Anyone trying to enter uninvited here, would have faced defenders firing from above, from the flanking walls, and from the keep ahead of them.
Check the English Heritage web site for further information.