The ramparts of the town occupying the southern declivities of the promontory were destroyed, and the inhabitants obliged to settle on the other side of the river, either to the south-east or to the south. The head of the bridge, C, was repaired. The gates of the camp had good _claviculæ_, each with two towers constructed of dry walling, earth, and timber work (Fig. 15). At regular intervals along the _vallum_--which, except the front on the N.N.E., exactly followed the edge of the plateau--were erected towers, or rather watch-towers, of timber. In addition to the supply from the wells within the limits of the camp, the Romans collected the water of the springs on the northern plateau, by means of pipes made of trunks of trees bored lengthwise and joined end to end. This channel followed the roadway G, and conducted the water into six good cisterns, hollowed out in the rock and lined with cement. There was a cistern under the Prætorium, and two for each of the legions. On the western side palisades connected the smaller camp with the ditch sunk near the angle of the Prætorium; while on the eastern side of the plateau its escarpment rendered this precaution unnecessary. The engineer entrusted with the setting out had disposed the fosse in an oblique direction, as shown in Fig. 14, so as to present a larger front to assailants who, having taken the smaller camp, should present themselves on the _place d'armes_, H. The projecting angle was well defended by the Prætorium, and the obliquity of the _vallum_ enabled the defenders making a sortie by the Prætorian gate, and by that marked F, to take the enemy almost in rear, and to drive them over the eastern declivity of the plateau. [Illustration: FIG. 15.] The rampart walk of the _vallum_ was raised three feet above the level of the camp, and was furnished with a cresting of stakes with wattling to retain the earth on the parapet (see Fig. 15). The fosse was twelve feet wide and seven deep, and was continued all round the camp, even on the sides where the declivities were steep. The Némède was demolished. The Druids had it re-erected on the plateau in front of the camp, to the south, at the entrance of the wood. The inhabitants of the Val d'Avon were enjoined, under penalty of seeing their town destroyed, to abstain from injuring these intrenchments while unoccupied; they were even charged to keep them in repair, and to supply provisions to the troops who should be quartered there to protect the country against the invasions of the barbarians; for as Gaul was then tranquilized internally, and brought under the Roman sway, there was nothing to fear, except the attacks of the Germans, who were continually threatening the north-eastern provinces.