Sabinus, being the most exposed, had, in addition to his legion, a few cohorts lately raised in Italy. Caesar, having no particular business to take him over the Alps, remained, with Trebonius attending to general business. His dispositions had been carefully watched by the Gauls. Caesar, they supposed, would go away as usual; they even believed that he had gone; and a conspiracy was formed in the north to destroy the legions in detail. The instigator of the movement was Induciomarus, the leader of the patriot party among the Treveri, whose intrigues had taken Caesar to the Moselle before the first visit to Britain. At that time Induciomarus had been able to do nothing; but a fairer opportunity had arrived. The overthrow of the great German horde had affected powerfully the semi-Teutonic populations on the left bank of the Rhine. The Eburones, a large tribe of German race occupying the country between Liége and Cologne, had given in their submission; but their strength was still undiminished, and Induciomarus prevailed on their two chiefs, Ambiorix and Catavoleus, to attack Sabinus and Cotta. It was midwinter. The camp at Tongres was isolated. The nearest support was seventy miles distant. If one Roman camp was taken, Induciomarus calculated that the country would rise; the others could be separately surrounded, and Gaul would be free. The plot was well laid. An entrenched camp being difficult to storm, the confederates decided to begin by treachery. Ambiorix was personally known to many of the Roman officers. He sent to Sabiuus to say that he wished to communicate with him on a matter of the greatest consequence. An interview being granted, he stated that a general conspiracy had been formed through the whole of Gaul to surprise and destroy the legions. Each station was to be attacked on the same day, that they might be unable to support each other. He pretended himself to have remonstrated; but his tribe, he said, had been carried away by the general enthusiasm for liberty, and he could not keep them back. Vast bodies of Germans had crossed the Rhine to join in the war. In two days at the furthest they would arrive. He was under private obligations to Caesar, who had rescued his son and nephew in the fight with the Aduatuci, and out of gratitude he wished to save Sabinus from destruction, which was otherwise inevitable. He urged him to escape while there was still time, and to join either Labienus or Cicero, giving a solemn promise that he should not be molested on the road.