Clodoald could not attempt anything before the northern salient, the enemy being there in front of him in force; but within the salient itself he sunk ditches with retrenchments of earth and stakes, as shown in [Fig. 24]. These works being low and masked were invisible to the enemy outside. Every night he sent out of the city, by the postern which led to the bottom of the wide fosse on the northern front, spies who rendered him an account of the operations of the enemy.

At the end of the third week from the beginning of the siege, his spies reported a considerable degree of activity in the large camp; that faggots were being got ready, that the soldiers were preparing their arms, and that war-engines were being mounted. One of these spies, who crossed the river below the town and observed the attitude of the enemy encamped on the west, brought a similar report. Clodoald judged, therefore, that the besiegers were on the point of attempting a grand effort on the west and the north.

On the morning of the twenty-third day of the siege, in fact, four onagri planted on the work opposite the small tête de pont swept the latter with stones so effectually that the defenders were scarcely sheltered behind the parapets, and could not work the engines placed at that point. At the same time, boats laden with inflammable materials were launched in the river above the wooden bridge. These boats, impelled in the direction required, were arrested by the piles of the bridge, and were not long in setting it on fire ([Fig. 25]). The defenders of the small tête de pont, seeing that their retreat was going to be cut off, abandoned the work, which was soon occupied by the Franks. Retired within the place d'armes behind the bridge, the besieged could do nothing but watch the fire.

Fig 25.

At the same time, shielded by wicker mantelets, a numerous troop of the enemy were advancing boldly against the north-east and north-west flanks of the northern salient. Filling up the fosse with faggots, the assailants rushed in a dense column against the rampart. The conflict was furious. Thanks to the stonework of the aqueduct the enemy were unable to break through the north-east flank; but they succeeded in gaining a footing [See [Fig. 24.]] on the opposite one. The besieged were obliged to abandon the salient, retiring from one retrenchment to another, and with but slight loss, whereas the assailants had more than two hundred men killed on the rampart and in the ditches.

At nightfall Clodoald with the three thousand men of his reserve corps issued suddenly by the central gate—the bridge of which, strongly barricaded, had remained in his possession—and fell upon the enemy: he killed a hundred more, but was unable to retake the work. Moreover, he anticipated another attack, and was not mistaken. Towards midnight the Franks took possession of the island of sand with the help of rafts, and there entrenched themselves in front of the quay. They were within bowshot, and arrows were discharged on both sides, but with little result.

The loss of the advanced work had only the effect of animating the besieged, who were for immediately re-taking it. Clodoald had to calm their ardour by promising them to do better than retake it; adding, that just then he had another enterprise in view, and that the enemy was going to give them a fine opportunity of beating him.

Clodoald strengthened the defences of the northern front, which could not be taken by storm; placed a strong body in the outwork of the eastern gate, with orders to defend it to the last man; and sent down as large a number of troops as they would hold into the two places d`armes south and south-west. He strongly manned the oblique entrenchment descending to the edge of the water, and placed there a chief on whom he could depend, with special instructions.