*Vercingetorix, 52 B. C.* A more serious movement started in 52 B. C. among the peoples of central Gaul who found a national leader in Vercingetorix, a young noble of the Arverni. The revolt took Caesar by surprise when he was in Cisalpine Gaul and his troops still scattered in winter quarters. He recrossed the Alps with all haste, secured the Narbonese province and succeeded in uniting his forces. These he strengthened with German cavalry from across the Rhine. However, a temporary check in an attack upon the position of Vercingetorix at Gergovia caused the Aedui to desert the Roman cause, and the revolt spread to practically the whole of Gaul. Caesar was on the point of retiring to the province, but after repulsing an attack made upon him he was able to pen up Vercingetorix in the fortress of Alesia. A great effort made by the Gauls to relieve the siege failed to break Caesar’s lines, and the defenders were starved into submission. The crisis was over, although another year was required before the revolting tribes were all reduced to submission and the Roman authority re-established (51 B. C.). Caesar used all possible mildness in his treatment of the conquered and the Gauls were not only pacified but won over. In the days to come they were among his most loyal supporters. The conquest of Gaul was an event of supreme importance for the future history of the Roman empire, and for the development of European civilization as well. For the time _Gallia comata_ was not formed into a province. Its peoples were made allies of Rome, under the supervision of the governor of Narbonese Gaul, under obligation to furnish troops and for the most part liable to a fixed tribute. Caesar’s campaign in Gaul had given him the opportunity to develop his unusual military talents and to create a veteran army devoted to himself. His power had become so great that both Pompey and the Optimates desired his destruction and he was in a position to refuse to be eliminated without a struggle. The plots laid in Rome to deprive him of his power had made him hasten to quell the revolt of the Gauls with all speed. When this was accomplished he was free to turn his attention to Roman affairs.