Gallic War (7.23-7.26)

But this is usually the form of all the Gallic walls. Straight beams, connected lengthwise and two feet distant from each other at equal intervals, are placed together on the ground; these are mortised on the inside, and covered with plenty of earth. But the intervals which we have mentioned, are closed up in front by large stones. These being thus laid and cemented together, another row is added above, in such a manner, that the same interval may be observed, and that the beams may not touch one another, but equal spaces intervening, each row of beams is kept firmly in its place by a row of stones. In this manner the whole wall is consolidated, until the regular height of the wall be completed. This work, with respect to appearance and variety, is not unsightly, owing to the alternate rows of beams and stones, which preserve their order in right lines; and, besides, it possesses great advantages as regards utility and the defense of cities; for the stone protects it from fire, and the wood from the battering ram, since it [the wood] being mortised in the inside with rows of beams, generally forty feet each in length, can neither be broken through nor torn asunder.

The siege having been impeded by so many disadvantages, the soldiers, although they were retarded during the whole time by the mud, cold, and constant showers, yet by their incessant labor overcame all these obstacles, and in twenty-five days raised a mound three hundred and thirty feet broad and eighty feet high. When it almost touched the enemy's walls, and Caesar, according to his usual custom, kept watch at the work, and encouraged the soldiers not to discontinue the work for a moment: a little before the third watch they discovered that the mound was sinking, since the enemy had set it on fire by a mine; and at the same time a shout was raised along the entire wall, and a sally was made from two gates on each side of the turrets. Some at a distance were casting torches and dry wood from the wall on the mound, others were pouring on it pitch, and other materials, by which the flame might be excited, so that a plan could hardly be formed, as to where they should first run to the defense, or to what part aid should be brought. However, as two legions always kept guard before the camp by Caesar's orders, and several of them were at stated times at the work, measures were promptly taken, that some should oppose the sallying party, others draw back the towers and make a cut in the rampart; and moreover, that the whole army should hasten from the camp to extinguish the flames.

When the battle was going on in every direction, the rest of the night being now spent, and fresh hopes of victory always arose before the enemy: the more so on this account because they saw the coverings of our towers burnt away, and perceived, that we, being exposed, could not easily go to give assistance, and they themselves were always relieving the weary with fresh men, and considered that all the safety of Gaul rested on this crisis; there happened in my own view a circumstance which, having appeared to be worthy of record, we thought it ought not to be omitted. A certain Gaul before the gate of the town, who was casting into the fire opposite the turret balls of tallow and fire which were passed along to him, was pierced with a dart on the right side and fell dead. One of those next him stepped over him as he lay, and discharged the same office: when the second man was slain in the same manner by a wound from a cross-bow, a third succeeded him, and a fourth succeeded the third: nor was this post left vacant by the besieged, until, the fire of the mound having been extinguished, and the enemy repulsed in every direction, an end was put to the fighting.

The Gauls having tried every expedient, as nothing had succeeded, adopted the design of fleeing from the town the next day, by the advice and order of Vercingetorix. They hoped that, by attempting it at the dead of night, they would effect it without any great loss of men, because the camp of Vercingetorix was not far distant from the town, and the extensive marsh which intervened, was likely to retard the Romans in the pursuit. And they were now preparing to execute this by night, when the matrons suddenly ran out-into the streets, and weeping cast themselves at the feet of their husbands, and requested of them, with every entreaty, that they should not abandon themselves and their common children to the enemy for punishment, because the weakness of their nature and physical powers prevented them from taking to flight. When they saw that they (as fear does not generally admit of mercy in extreme danger) persisted in their resolution, they began to shout aloud, and give intelligence of their flight to the Romans. The Gauls being intimidated by fear of this, lest the passes should be pre-occupied by the Roman cavalry, desisted from their design.