_Sixth Campaign_, B.C. 63.--In the next year the Gauls again took up arms, and entered into a most formidable conspiracy to recover their independence. The destruction of the Roman troops under Sabinus and Cotta, and the unsettled state of Gaul during the winter, had led Caesar to apprehend a general rising of the natives; and he had accordingly levied two new legions in Cisalpine Gaul, and obtained one from Pompey, who was remaining in the neighborhood of Rome as Proconsul with the imperium. Being thus at the head of a powerful army, he was able to subdue the tribes that revolted, and soon compelled the Nervii, Senones, Carnutes, Menapii, and Treviri to return to obedience. But as the Treviri had been supported by the Germans, he crossed the Rhine again a little above the spot where he had passed over two years before, and, after receiving the submission of the Ubii, ravaged the country of the Suevi. On his return to Gaul he laid waste the country of the Eburones with fire and sword. At the conclusion of the campaign he prosecuted a strict inquiry into the revolt of the Senones and Carautes, and caused Acco, who had been the chief ringleader in the conspiracy, to be put to death. _Seventh Campaign_, B.C. 52.--The unsuccessful issue of last year's revolt had not yet damped the spirits of the Gauls. The execution of Acco had frightened all the chiefs, as every one feared that his turn might come next; the hatred of the Roman yoke was intense; and thus all the materials were ready for a general conflagration. It was first kindled by the Carnutes, and in a short time it spread from district to district till almost the whole of Gaul was in flames. Even the AEdui, who had been hitherto the faithful allies of the Romans, and had assisted them in all their wars, subsequently joined the general revolt. At the head of the insurrection was Vercingetorix, a young man of noble family belonging to the Arverni, and by far the ablest general that Caesar had yet encountered. Never before had the Gauls been so united: Caesar's conquests of the last six years seemed to be now entirely lost. The campaign of this year, therefore, was by far the most arduous that Caesar had yet carried on; but his genius triumphed over every obstacle, and rendered it the most brilliant of all. He concentrated his forces with incredible rapidity, and lost no time in attacking the chief towns in the hands of the enemy. Vellaunodunum (in the country of _Chateau-Landon_), Genabum (_Orleans_), and Noviodunum (_Nouan_, between Orleans and Bourges), fell into his hands without difficulty. Alarmed at his rapid progress, Vercingetorix persuaded his countrymen to lay waste their country and destroy their towns. This plan was accordingly carried into effect; but, contrary to the wishes of Vercingetorix, Avaricum (_Bourges_), the chief town of the Bituriges, and a strongly-fortified place, was spared from the general destruction. This town Caesar