The British camp was oblong, following the figure of the hill. It was composed of a deep and broad ditch, the contents of which were in part thrown inwards and upwards so as to form a bank. The area thus enclosed measured within the bank about 875 yards by 350 yards, the latter being its diameter at the cliff, by which it is cut off, the northern end running to a point. This main ditch has probably been deepened and more or less altered during the Norman period, and it is now connected with various bastions, hornworks, and caponnières, but its general outline is sufficiently clear, and it may, from internal evidence, be presumed to be British. Within the area, rather nearer to its northern end, a second earthwork, also composed of bank and ditch, has been thrown up. This includes the lighthouse tower, and is therefore called the Roman ditch, but there is nothing about it of a Roman character, and it is far more probable that it was the work of the English, and formed the inner defence of the castle which Harold undertook to surrender. The space between this and the great earthwork forms the outer ward of the Norman castle; the inner work has been divided into two parts. That to the south, containing the lighthouse, forms the middle ward; that to the north contains the keep, and is the inner ward. The lighthouse has been employed as a belfry to the adjacent church of St. Mary, which is the subject of an excellent memoir by Mr. Puckle, though he can scarcely be admitted to establish its connexion with the British church. The two are undoubtedly the oldest buildings within the castle area. The _Keep_ and _Inner Ward_ are Norman, of the reign of Henry II., but the curtain and most of its towers have been refaced or rebuilt, a great part recently, but more or less on the old lines. The plan is an irregular polygon, about 120 yards each way, with fourteen rectangular mural towers of no internal projection, and not rising above the curtain, which, however, is lofty. Two of those to the south-west take their name from Magminot and one from Gore. The walls were of flint rubble, quoined with ashlar, and battering outside at the base, the top of which is marked by a bold cordon of stone. Upon the sides of some of the towers are bold machicolated openings from garderobes. The keep stands detached in the centre of the ward, and within the area, built against the walls, are several buildings, as Arthur’s Hall, the guard chamber, and the officers’ quarters, some of early English character, others modern.