The town of Noviodunum (_Sancerre_), belonging to this latter people, lay in Cæsar’s route; he undertook to lay siege to it. The inhabitants were already hastening to make their submission, and a part of the hostages had been delivered, when they saw in the distance the cavalry of Vercingetorix, who, warned of the approach of the Romans, had raised the siege of Gorgobina, and marched to meet them. At this sight, the besieged, mustering courage again, seize their arms, shut their gates, and man the wall. The Roman cavalry was immediately sent to meet the enemy; staggered at the first shock, it was on the point of giving way; but soon, supported by about 400 German cavalry, in Cæsar’s pay since the commencement of the campaign, they entirely routed the Gauls. This defeat having again spread terror in the town, the inhabitants delivered up the instigators of the revolt, and surrendered. Cæsar marched thence, through the fertile territory of the Biturges, towards Avaricum (_Bourges_), the largest and strongest _oppidum_ of that people. The taking of this town, he considered, would render him master of the whole country.[469] [Sidenote: Siege of Avaricum.] IV. Vercingetorix, after having experienced so many reverses successively at Vellaunodunum, at Genabum, and at Noviodunum, convokes a council, in which he explains the necessity of adopting a new system of warfare. Above all, according to him, they must take advantage of the season, and of the numerous Gaulish cavalry, to cut off the Romans from provisions and forage, sacrifice private interest to the common welfare, set fire to the habitations, burgs, and _oppida_ which they could not defend, so as to spread desolation from the territory of the Boii as far as the enemy could extend his incursions. If that be an extreme sacrifice, it is nothing in comparison with death and slavery. This advice having been unanimously approved, the Bituriges, in one single day, set fire to more than twenty towns; the neighbouring countries follow their example. The hope of a speedy victory made them support this painful sight with resignation. They deliberated whether Avaricum should not undergo the same fate; the Bituriges implored them to spare one of the most beautiful towns in Gaul, the ornament and bulwark of their country; “the defence of it will be easy,” they added, “on account of its almost inaccessible position.” Vercingetorix, at first of a contrary opinion, ended by giving way to this general feeling of compassion, entrusted the place to men capable of defending it, and, following Cæsar by short marches, pitched his camp in a spot defended by woods and marshes, sixteen miles from Avaricum[470] (two kilomètres to the north of _Dun-le-Roy_, at the confluence of the Auron and the Taisseau).