The Romans found in the town large magazines of corn and other provisions, which had been laid in for the siege, and Caesar remained there some days to refresh his troops. The winter was now over. The Aedui were giving him anxiety, and as soon as he could he moved to Decize, a frontier town belonging to them on the Loire, almost in the very centre of France. The anti-Roman faction were growing in influence. He called a council of the principal persons, and, to secure the fidelity of so important a tribe, he deposed the reigning chief and appointed another who had been nominated by the Druids.[5] He lectured the Aedui on their duty, bade them furnish him with ten thousand men, who were to take charge of the commissariat, and then divided his army. Labienus, with four legions, was sent to compose the country between Sens and Paris. He himself, with the remaining six legions, ascended the right bank of the Allier towards Gergovia in search of Vercingetorix. The bridges on the Allier were broken, but Caesar seized and repaired one of them and carried his army over. The town of Gergovia stood on a high plateau, where the rivers rise which run into the Loire on one side and into the Dordogne on the other. The sides of the hill are steep, and only accessible at a very few places, and the surrounding neighborhood is broken with rocky valleys. Vercingetorix lay in force outside, but in a situation where he could not be attacked except at disadvantage, and with his communication with the fortress secured. He was departing again from his general plan for the campaign in allowing Gergovia to be defended; but it was the central home of his own tribe, and the result showed that he was right in believing it to be impregnable. Caesar saw that it was too strong to be stormed, and that it could only be taken after long operations. After a few skirmishes he seized a spur of the plateau which cut off the garrison from their readiest water-supply, and he formed an entrenched camp upon it. He was studying the rest of the problem when bad news came that the Aedui were unsteady again. The ten thousand men had been raised as he had ordered, but on their way to join him they had murdered the Roman officers in charge of them, and were preparing to go over to Vercingetorix. Leaving two legions to guard his works, he intercepted the Aeduan contingent, took them prisoners, and protected their lives. In his absence Vercingetorix had attacked the camp with determined fury. The fighting had been desperate, and Caesar only returned in time to save it. The reports from the Aedui were worse and worse. The patriotic faction had the upper hand, and with the same passionate determination to commit themselves irrevocably, which had been shown before at Gien, they had massacred every Roman in their territory. It was no time for delaying over a tedious siege: Caesar was on the point of raising it, when accident brought on a battle under the walls. An opportunity seemed to