Gallic War (7.31-7.34)

Nor did Vercingetorix use less efforts than he had promised, to gain over the other states, and [in consequence] endeavored to entice their leaders by gifts and promises. For this object he selected fitting emissaries, by whose subtle pleading or private friendship, each of the nobles could be most easily influenced. He takes care that those who fled to him on the storming of Avaricum should be provided with arms and clothes. At the same time that his diminished forces should be recruited, he levies a fixed quota of soldiers from each state, and defines the number and day before which he should wish them brought to the camp, and orders all the archers, of whom there was a very great number in Gaul, to be collected and sent to him. By these means, the troops which were lost at Avaricum are speedily replaced. In the mean time, Teutomarus, the son of Ollovicon, the king of the Nitiobriges, whose father had received the appellation of friend from our senate, came to him with a great number of his own horse and those whom he had hired from Aquitania .

Caesar, after delaying several days at Avaricum , and, finding there the greatest plenty of corn and other provisions, refreshed his army after their fatigue and privation. The winter being almost ended, when he was invited by the favorable season of the year to prosecute the war and march against the enemy, [and try] whether he could draw them from the marshes and woods, or else press them by a blockade; some noblemen of the Aedui came to him as embassadors to entreat "that in an extreme emergency he should succor their state; that their affairs were in the utmost danger, because, whereas single magistrates had been usually appointed in ancient times and held the power of king for a single year, two persons now exercised this office, and each asserted that he was appointed according to their laws. That one of them was Convictolitanis, a powerful and illustrious youth; the other Cotus, sprung from a most ancient family, and personally a man of very great influence and extensive connections. His brother Valetiacus had borne the same office during the last year: that the whole state was up in arms; the senate divided, the people divided; that each of them had his own adherents; and that, if the animosity would be fomented any longer, the result would be that one part of the state would come to a collision with the other; that it rested with his activity and influence to prevent it."

Although Caesar considered it ruinous to leave the war and the enemy, yet, being well aware what great evils generally arise from internal dissensions, lest a state so powerful and so closely connected with the Roman people, which he himself had always fostered and honored in every respect, should have recourse to violence and arms, and that the party which had less confidence in its own power should summon aid from Vercingetorix, he determined to anticipate this movement; and because, by the laws of the Aedui, it was not permitted those who held the supreme authority to leave the country, he determined to go in person to the Aedui, lest he should appear to infringe upon their government and laws, and summoned all the senate, and those between whom the dispute was, to meet him at Decetia. When almost all the state had assembled there, and he was informed that one brother had been declared magistrate by the other, when only a few persons were privately summoned for the purpose, at a different time and place from what he ought, whereas the laws not only forbade two belonging to one family to be elected magistrates while each was alive, but even deterred them from being in the senate, he compelled Cotus to resign his office; he ordered Convictolitanis, who had been elected by the priests, according to the usage of the state, in the presence of the magistrates, to hold the supreme authority.

Having pronounced this decree between [the contending parties], he exhorted the Aedui to bury in oblivion their disputes and dissensions, and, laying aside all these things, devote themselves to the war, and expect from him, on the conquest of Gaul, those rewards which they should have earned, and send speedily to him all their cavalry and ten thousand infantry, which he might place in different garrisons to protect his convoys of provisions, and then divided his army into two parts: he gave Labienus four legions to lead into the country of the Senones and Parisii ; and led in person six into the country of the Arverni, in the direction of the town of Gergovia , along the banks of the Allier . He gave part of the cavalry to Labienus and kept part to himself. Vercingetorix, on learning this circumstance, broke down all the bridges over the river and began to march on the other bank of the Allier .