The wounded Burgundians remaining in their hands were decapitated; and their heads, stuck on long poles, were ranged in a line at a hundred paces from the advanced work. This, however, did not constitute a countervallation sufficient to protect them from the sorties of the besieged. It was therefore decided that the army on the north side should dig a ditch at two hundred paces from the advanced work, which should extend from the river valley to that of the rivulet; the ditch to be about two thousand paces long, and behind this ditch, with the earth dug out and barricades (of branches), an intrenchment was to be raised. They could thus in the first place obviate any attack of the besieged at this point. In the second place, it was resolved to seize the great _tête de pont_. The only communication with the outside then left to the besieged would be the valley of the rivulet; but this valley was almost impracticable, full as it was of bogs and marshes; so that the inhabitants of the city could attempt nothing on this side. As to assistance from without, it was deemed out of the question then to expect any; in any case, to prevent the besieged from issuing by the eastern gate, a well-guarded work should be raised in front of it; next, to prevent the besieged from getting provisions, the country on the left bank of the river should be devastated. As regarded the aqueduct, it was discovered and cut off. These measures resolved upon, the besiegers set to work without loss of time. But Clodoald, who had been present at more than one siege, knew by experience that a garrison which had no expectation of help from without, has but one means of safety, viz. to allow the besieger no respite, especially at the commencement of the investment, when the enemy had not yet been able to complete his works and effect a close siege. Without knowing exactly what the army of the Franks had in contemplation, he knew its numerical force, and did not doubt that it commanded the services of some Latin engineers, as such was the case at the siege of Autun. Clodoald therefore divided his troops into eight bodies. The inclosure[12] being defended by forty-four towers, eleven hundred and eighty men were required to guard them, reckoning twenty-five men for each of the thirty-six towers of this inclosure, and thirty-five for each of the eight towers of the gates, or seventy men for each gate and its works. The post of each tower, it must be understood, was, in conformity with the military usages of the time, intrusted with the guard of the neighbouring curtain. The guard of the northern outwork required two hundred men; for the _place d'armes_ on the south, and the _têtes de pont_, five hundred men; to garrison the stronghold (_Castellum_) one hundred men; to watch the rampart on the north descending from the angle of the city to the river, and to guard its banks, six hundred men. Total for the ordinary guard of the defences, two thousand five hundred and eighty men.