The most celebrated of these camps is that of Cissbury, three miles north of Worthing. We may also mention that of Hod-Hill in Dorsetshire, which greatly resembles the one at Cissbury, but we will describe the latter in some detail.17 It is situated on a somewhat lofty plateau of irregular form, its site having been chosen with great skill as one offering great facilities for defence. The earthen ramparts and the fosses protecting them cover an area of sixty acres, and their importance varies according to the relief of the ground; thus the thickness of the walls is very much greater on the eastern side where an attack would have been most fraught with danger; four doors give access to the interior, and on each side of these doors are ruins of rectangular structures strengthening their defence. Archæologists, however, are of opinion that these redoubts, though their construction is exactly similar to the rest of the fortifications, are of more recent date. In fact Roman tiles have been found amongst the ruins, but these really prove nothing, as every one is agreed that Cissbury was occupied by the Romans after the subjugation of England by them; and the only point at issue is really whether the walls of which the ruins still remain date from the Roman period, or from times prior to their arrival. We ourselves lean to the latter opinion, as drinking-water is absolutely wanting; a very important point, as the Roman generals always made it their first care to pitch their camps near a good water-supply. On the western slope at Cissbury on each side of the ramparts are fifty funnel-shaped depressions, some of which are as much as seventy feet in diameter and twelve feet deep. These holes may have served as refuges, and the larger ones were certainly lived in, as is proved by the charred stones of the hearths and the pieces of charcoal found near them; moreover, Tacitus18 tells us that the Germans lived in similar habitations. Whatever, however, may have been their ultimate use, these hollows were in the first place dug out with a view to obtaining flints in the marly chalk forming the bill; and recent excavations have revealed the existence of galleries connecting the depressions. When they became later human habitations some of the inside openings were blocked up with lumps of chalk, carefully piled up so as to make entrance extremely difficult, greatly adding to the security of the inmates.