Our list is very far from being a complete list of all the Anglo-Saxon boroughs existing in Edward's day. In the document known as the "Burghal Hidage" we have another quite different list of thirty-two boroughs,[63] which, according to Professor Maitland, "sets forth certain arrangements made early in the 10th century for the defence of Wessex against the Danish inroads."[64] Five at least on the list are Roman chesters; twenty are mentioned as boroughs in Domesday Book. There are two among them which are of special interest, because there is reason to believe that the earthen ramparts which still surround them are of Saxon origin: Wallingford and Wareham. Both these fortifications are after the Roman pattern, the earthen banks forming a square with rounded corners.[65] See Fig. 3. To complete our knowledge of Anglo-Saxon fortification, we ought to examine the places mentioned in Anglo-Saxon charters as royal seats, where possibly defensive works of some kind may have existed. Unfortunately we are unable to learn that there are any such works, except at one place, Bensington in Oxfordshire, where about a hundred years ago "a bank and trench, which seem to have been of a square form," were to be seen.[66] [Illustration:FIG. 3. Wallingford, Berks. Wareham, Dorset.] In the following chapter we shall deal in detail with such archæological remains as still exist of the boroughs of Edward and Ethelfleda, but here we will briefly summarise by anticipation the results to which that chapter will lead. We see that sites defensible by nature were often seized upon for fortification, as at Bamborough, Bridgenorth, and Eddisbury; but that this was by no means always the case, as a weak site, such as Witham, for example, was sometimes rendered defensible by works which appear to have fulfilled their purpose. In only one case (Witham) do we find an inner enclosure; and as it is of large size (9-1/2 acres) it is more probable that the outer enclosure was for cattle, than that the inner one was designed solely for the protection of the king and his court. We are not told of stone walls more than once (at Towcester); but the use of the word _timbrian_, which does not exclusively mean to build in wood,[67] does not preclude walls of stone in important places. In the square or oblong form, with rounded corners, we see the influence which Roman models exercised on eyes which still beheld them existing.