Under King Louis the outer enceinte of Carcassonne was rebuilt (Fig. 111). Between this and the inner wall of enceinte a space is left, called the “lices,” in which troops can circulate, and patrols and sentries move in safety. The ground of the “lices” is nearly on the same level as the present parapet of the outer wall, while the wall is about thirty feet above the soil outside. The towers are built with an open side next the “lices,” so that, even if taken by the enemy, they could not be held by him against the inner walls. St Louis also erected an immense barbican, or round redoubt, at the base of the hill, between Carcassonne and the Aude, so as to command the river, and allow of sorties being made on the level ground adjoining it. Philippe le Hardi continued the works of the fortifications [Illustration: FIG. 112. CARCASSONNE--PORTE NARBONNAISE.] till his death in 1285, his operations being chiefly on the east and south sides. There are two principal gateways in the walls, the Porte de l’Aude and the PORTE NARBONNAISE (Fig. 112), both strongly defended with towers and other works. There are also six posterns, all placed in angles so as to be masked by the towers, and generally several feet above the level of the ground. These were useful for relieving sentries, and for the movement of troops in the “lices.” Opposite some of the posterns the outer walls are provided with large barbicans (Fig. 113), in which soldiers might be concentrated for sorties. As above mentioned, the great circular barbican at the base of the hill was also employed for this purpose. Nothing could give a better idea of the multiplicity and complication of the means of defence then employed than the mode of connection between this barbican and the castle. The rampart or passage which led to the castle above was especially well fortified. It was steep, and the ascent was interrupted with several cross walls with doors, approached by steps which were all commanded from the walls and curtains above, and from a great tower at the top, all armed with _bretêches_ or hoards. Towards the upper end the passage turned to the right, and was flanked by the defences above. A small gate was then reached, within which the passage doubled back again to the left, and was stopped by another gate, beyond which it entered a narrow covered way of three storys in height, each commanding the one below by means of machicolations or apertures in the floor, so that, if the first floor was gained, the assailant found himself in a trap, and was battered from above. If all these defences were surmounted, the besieger was only the length of the “lices,” and had still above him the lofty walls and towers of the castle, and the strongly-fortified [Illustration: FIG. 113. CARCASSONNE--WESTERN WALLS AND BARBICAN.]