The chancel was about 18 feet broad by 28 feet long. Of its walls only a few traces remain. It communicated on the north side with a small chamber, perhaps a garderobe, and on the south side with the vestry. The vestry, called also the chapter-house, is a small, nearly square chamber, 12 feet by 15 feet, with a plain Norman recess in its east wall, and the jambs of a door, evidently Norman, opening into what seems to have been a sort of lean-to cloister resting on the south wall of the nave. The cloister itself is gone; but in the nave wall are traces of an arcade. Here are three graves inclosed in pieces of stone placed edgeways, and a much worn _dos-d’âne_ coffin-lid. The breadth of the nave is wide for a single span, but if there were aisles, there must have been two, the arches being central, and in that case very narrow ones, even for a Norman church. The floor of the chancel is three steps above that of the nave. The curtain wall along the north front and over the mound is apparently of Norman date, as is most of the east wall; but its buttress-towers and the gateway are probably insertions of the reign of Henry III. or Edward. The chapel may be later than the north wall, probably of the reign of Henry II. or John. The old part of the masonry is coursed rubble, with occasional pebble-stones, faced with bold, open-jointed ashlar, the blocks being rudely dressed. In one part, near the church, is a little herring-bone work, though probably not older than, if so old as, the rest. The quoins and window-dressings, where preserved, are good ashlar. Various fragments of cut stone are collected and heaped up; of these, a few are late Norman, some good early English, some Perpendicular. A late Norman crypt has been discovered in the town. It may be doubted whether William or his feudatories, the Earl of Eu or de Tiliol, added defences in masonry to the works already existing. At least, there is no evidence that they did so, and the oldest masonry now seen is certainly not very early Norman, though too early to have allowed time for the decay of any previous masonry of the same architectural period. The chapel was probably founded in the reign of Henry I., and though the castle was erected, and for some time held, under the Crown, by the powerful Earls of Eu, it was never a great baronial residence, being in that respect far inferior to Arundel or Lewes, but was probably maintained only as a strong, though small, post to cover embarkations for, or disembarkations from, Normandy. The _Outer Ward_ is contained between the inner and outer lines of ditch; within the latter is a considerable bank of earth, which rises at the north-east angle and is continued across the northern end, that being naturally the weakest part of the inclosure. It does not appear where was the entrance of this ward, but possibly near the south-east angle. There are no traces of masonry here, so that the defences of the outer ward may have been a stockade only.