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Rh of the ditch. The doorway from the bridge had no door, but those of the lateral sally-ports opened inwards. In the further, or north wall is another doorway, also shouldered, 3 ft. broad and 8 ft. high, the door of which also opened inwards and disclosed a very steep flight of eleven steps, rising about 8 ft. in a dovetail-shaped chamber, commencing at a breadth of 3 ft. and expanding to 8 ft. It is 14 ft. long. The steps land on a floor, but the walls, of which the lower 6 ft. 6 in., of ashlar, are quite perfect, have so far no openings. This singular chamber is niched into the counterscarp of the ditch, and is actually within the barbican.

The remains of the barbican (F) are a considerable knoll of earth, having a ditch of its own, and on its rugged surface showing traces of old buildings. This covers the head of the bridge, and appears to have been approached by a winding road, and entered on the west side.

This work has been the subject of much speculation. That it was the main entrance is sufficiently certain. This could only have been at one end of the main ward, and the remaining jamb is too large for a postern, and the ground at the opposite end far too steep for an approach.

The spur-work, with its lateral curtains, completely enclosed the entrance. The steps to the bridge are modern, but must represent others somewhat similar. The doors and passage were calculated for single files only, with a special arrangement for commanding the only point at which two armed men could pass. In the chamber beyond the bridge 80 or 100 men could assemble previous to a sally by the lateral doorways.

On their return, also, if pursued, and the enemy should re-enter with them, the narrow passages would make almost impossible a surprise or any sudden rush into either the body of the place or the barbican.

Further, looking to the lateral space between the walls, and the great length of the bridge-pit, it is pretty clear that above the foot passage was a roadway for wheel carriages, with at least one drawbridge. Most of the passages below seem to have been flagged with stone. One drawbridge was clearly over the remaining pit; another may have covered the chamber at this time occupied by the modern flight of stairs. The thickness (4 ft.) and solidity of the existing walls show that they must have been much higher, so that