But when the Haeduan Dumnorix, who likewise was present in the army destined for Britain, nominally as a cavalry officer, but really as a hostage, peremptorily refused to embark and rode home instead, Caesar could not do otherwise than have him pursued as a deserter; he was accordingly overtaken by the division sent after him and, when he stood on his defence, was cut down (700).

That the most esteemed knight of the most powerful and still the least dependent of the Celtic cantons should have been put to death by the Romans, was a thunder-clap for the whole Celtic nobility; every one who was conscious of similar sentiments--and they formed the great majority-- saw in that catastrophe the picture of what was in store for himself.
Insurrection If patriotism and despair had induced the heads of the Celtic nobility to conspire, fear and self-defence now drove the conspirators to strike.

In the winter of 700-701, with the exception of a legion stationed in Brittany and a second in the very unsettled canton of the Carnutes (near Chartres), the whole Roman army numbering six legions was encamped in the Belgic territory.

The scantiness of the supplies of grain had induced Caesar to station his troops farther apart than he was otherwise wont to do--in six different camps constructed in the cantons of the Bellovaci, Ambiani, Morini, Nervii, Remi, and Eburones.

The fixed camp placed farthest towards the east in the territory of the Eburones, probably not far from the later Aduatuca (the modern Tongern), the strongest of all, consisting of a legion under one of the most respected of Caesar's leaders of division, Quintus Titurius Sabinus, besides different detachments led by the brave Lucius Aurunculeius Cotta( 43) and amounting together to the strength of half a legion, found itself all of a sudden surrounded by the general levy of the Eburones under the kings Ambiorix and Catuvolcus.