These results are all inevitable. It is obvious that the first attacks must necessarily be made upon the east and south coasts, and that the inland districts and the west must only slowly be conquered afterward. Especially was it easy to found Teutonic kingdoms in the four isolated regions of Lincolnshire, East Anglia, Kent, and Sussex, each of which was cut off from the rest of England in early times by impassable fens, marshes, forests, or rivers. It was easy here to kill off the Welsh fighting population, to drive the remnants into the Fen Country or the Weald, to enslave the captives, the women, and the children, and to secure the Teutonic colony by a mark or border of woodland, swamp, or hill. On the other hand, Wessex, Northumbria, and Mercia, with a vague and ill-defined internal border, had harder work to fight their way in against a united Welsh resistance; and it was only very slowly that they pushed across the central watershed, to dismember the unconquered remnant of the Britons at last into the three isolated bodies of Damnonia (Cornwall and Devon), Wales Proper, and Strathclyde. This is probably why the earliest settlements were made in these isolated coast regions, and why the inward progress of the other colonies was so relatively slow. The South Saxons, then, at first occupied the three fertile bits of the county--the coast belt of Sussex Proper, the Valley of the Ouse, and the isolated Hastings district--because these were the best adapted for their strictly agricultural life. In spite of the legend of AElle, I do not suppose that they were all united from the first under a single principality. It seems far more probable that each little clan settlement was at first wholly independent; that afterwards three little chieftainships grew up in the three fertile strips--typified, perhaps, by the story of AElle's three sons--and that the whole finally coalesced into a single kingdom of the South Saxons, which is the state in which we find the county in Baeda's time. As ever, its boundaries were marked out for it by nature, for the Weald remained as yet an almost unbroken forest; and the names of Selsea, Pevensey, Winchelsea, Romney, and many others, show by their common insular termination (found in all isles round the British coast, as in Sheppey, Walney, Bardsea, Anglesea, Fursey, Wallasey, and so forth) that the marshland was still wholly undrained, and that a few islands alone stood here and there as masses of dry land out of their desolate and watery expanse. The Hastings district, too, fell more naturally to Sussex than to Kent, because the marshes dividing it from the former were far less formidable than those which severed it from the latter. Most probably the South Saxons intentionally aided nature in cutting off their territory from all other parts of Britain; for every English kingdom loved to surround itself with a distinct mark or border of waste, as a defence against invasion from outside.