2. There are those which consist of a tump or mound, sometimes wholly artificial, usually natural, and adapted by art, and in connection with this is a bass-court, usually, but not universally, quadrilateral. This was the Saxon type of burh; it was also that of the Merovingian. The classic passage descriptive of these is in the Life of S. John of Terouanne, written in the eleventh century:—
"It was customary for the rich men and nobles of these parts, because their main occupation is the carrying on of feuds, to heap up a mound of earth as high as they are able to raise it, and to dig round it a broad, open, and deep ditch, and to girdle the whole upper edge of the bank with a barrier of wooden planks, stoutly fastened together, and set round with numerous turrets, and this in place of a wall.
"Within was constructed a house, or rather a citadel, commanding the whole area, so that the gate of it could alone be reached by means of a bridge that sprang from the counterside of the ditch, and was gradually raised as it advanced, supported by sets of piers, two, or even three, trussed on each side, over convenient spans, crossing the moat with a managed ascent, so as to attain the upper level of the mound, landing on its edge level with the threshold of the door."
A very good idea of such a camp may be derived from the representation of the fortifications of Dnan on the Bayeux tapestry.
In France the mottes on which the wooden dongeons of the Merovingian chiefs were planted certainly abound; but in many cases the bank enclosing the bass-court has disappeared. Good examples may be seen at Plympton, at Lydford,
