He understood from the outset that he could not cope in the open field with Caesar and the Roman legions; he therefore exerted himself in getting together a body of cavalry numerous enough to harass the Romans during their movements, to attack their scattered detachments, to bear his orders swiftly to all quarters, and to keep up the excitement amongst the different peoplets with some hope of success.

His plan of campaign, his repeated instructions, his passionate entreaties to the confederates were to avoid any general action, to anticipate by their own ravages those of the Romans, to destroy everywhere, at the approach of the enemy, stores, springs, bridges, trees, and habitations: he wanted Caesar to find in his front nothing but ruins and clouds of warriors relentless in pursuing him without getting within reach.

Frequently he succeeded in obtaining from the people those painful sacrifices in the interest of the common safety; as when the Biturigians (inhabitants of the district of Bourges) burned in one day twenty of their towns or villages.

Vercingetorix adjured them also to burn Avaricum (Bourges), their capital; but they refused, and the capture of Avaricum, though gallantly defended, justified the urgency of Vercingetorix, seeing that it was an important success for Caesar and a serious blow for the Gauls.
Out of forty thousand combatants within the walls, it is said, scarcely eight hundred escaped the slaughter and succeeded in joining Vercingetorix, who had hovered continually in the neighborhood without being able to offer the besieged any effectual assistance.

Nor was it only against the Romans that he had to struggle; he had to fight amongst his own people, against rivalry, mistrust, impatience, and discouragement; he was accused of desiring, beyond everything, the mastery; he was even suspected of keeping up, with the view of assuring his own future, secret relations with Caesar; he was called upon to attack the enemy in front, and so bring the war to a decisive issue.