On the second day, when he came to Vellaunodunum, a town of the Senones , he determined to attack it, in order that he might not leave an enemy in his rear, and might the more easily procure supplies of provisions, and draw a line of circumvallation around it in two days: on the third day, embassadors being sent from the town to treat of a capitulation, he orders their arms to be brought together, their cattle to be brought forth, and six hundred hostages to be given. He leaves Caius Trebonius his lieutenant, to complete these arrangements; he himself sets out with the intention of marching as soon as possible, to Genabum , a town of the Carnutes, who having then for the first time received information of the siege of Vellaunodunum, as they thought that it would be protracted to a longer time, were preparing a garrison to send to Genabum for the defense of that town. Caesar arrived here in two days; after pitching his camp before the town, being prevented by the time of the day, he defers the attack to the next day, and orders his soldiers to prepare whatever was necessary for that enterprise; and as a bridge over the Loire connected the town of Genabum with the opposite bank, fearing lest the inhabitants should escape by night from the town, he orders two legions to keep watch under arms. The people of Genabum came forth silently from the city before midnight, and began to cross the river. When this circumstance was announced by scouts, Caesar, having set fire to the gates, sends in the legions which he had ordered to be ready, and obtains possession of the town so completely, that very few of the whole number of the enemy escaped being taken alive, because the narrowness of the bridge and the roads prevented the multitude from escaping. He pillages and burns the town, gives the booty to the soldiers, then leads his army over the Loire , and marches into the territories of the Bituriges.

Vercingetorix, when he ascertained the arrival of Caesar, desisted from the siege [of Gergovia], and marched to meet Caesar. The latter had commenced to besiege Noviodunum ; and when embassadors came from this town to beg that he would pardon them and spare their lives, in order that he might execute the rest of his designs with the rapidity by which he had accomplished most of them, he orders their arms to be collected, their horses to be brought forth, and hostages to be given. A part of the hostages being now delivered up, when the rest of the terms were being performed, a few centurions and soldiers being sent into the town to collect the arms and horses, the enemy's cavalry which had outstripped the main body of Vercingetorix's army, was seen at a distance; as soon as the townsmen beheld them, and entertained hopes of assistance, raising a shout, they began to take up arms, shut the gates, and line the walls. When the centurions in the town understood from the signal-making of the Gauls that they were forming some new design, they drew their swords and seized the gates, and recovered all their men safe.

Caesar orders the horse to be drawn out of the camp, and commences a cavalry action. His men being now distressed, Caesar sends to their aid about four hundred German horse, which he had determined, at the beginning, to keep with himself. The Gauls could not withstand their attack, but were put to flight, and retreated to their main body, after losing a great number of men. When they were routed, the townsmen, again intimidated, arrested those persons by whose exertions they thought that the mob had been roused, and brought them to Caesar, and surrendered themselves to him. When these affairs were accomplished, Caesar marched to the Avaricum , which was the largest and best fortified town in the territories of the Bituriges, and situated in a most fertile tract of country; because he confidently expected that on taking that town, he would reduce beneath his dominion the state of the Bituriges.

Vercingetorix, after sustaining such a series of losses at Vellaunodunum, Genabum , and Noviodunum , summons his men to a council. He impresses on them "that the war must be prosecuted on a very different system from that which had been previously adopted; but they should by all means aim at this object, that the Romans should be prevented from foraging and procuring provisions; that this was easy, because they themselves were well supplied with cavalry, and were likewise assisted by the season of the year; that forage could not be cut; that the enemy must necessarily disperse, and look for it in the houses, that all these might be daily destroyed by the horse. Besides that the interests of private property must be neglected for the sake of the general safety; that the villages and houses ought to be fired, over such an extent of country in every direction from Boia, as the Romans appeared capable of scouring in their search for forage. That an abundance of these necessaries could be supplied to them, because they would be assisted by the resources of those in whose territories the war would be waged: that the Romans either would not bear the privation, or else would advance to any distance from the camp with considerable danger; and that it made no difference whether they slew them or stripped them of their baggage, since, if it was lost, they could not carry on the war. Besides that, the towns ought to be burned which were not secured against every danger by their fortifications or natural advantages; that there should not be places of retreat for their own countrymen for declining military service, nor be exposed to the Romans as inducements to carry off abundance of provisions and plunder. If these sacrifices should appear heavy or galling, that they ought to consider it much more distressing that their wives and children should be dragged off to slavery, and themselves slain; the evils which must necessarily befall the conquered.