Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Retaliatory Expedition against the Eburones
Accounts had thus been settled with all the tribes that took part in the rising; the Eburones alone were passed over but not forgotten. Since Caesar had met with the disaster of Aduatuca, he had worn mourning and had sworn that he would only lay it aside when he should have avenged his soldiers, who had not fallen in honourable war, but had been treacherously murdered. Helpless and passive the Eburones sat in their huts and looked on as the neighbouring cantons one after another submitted to the Romans, till the Roman cavalry from the Treverian territory advanced through the Ardennes into their land.
So little were they prepared for the attack, that the cavalry had almost seized the king Ambiorix in his house; with great difficulty, while his attendants sacrificed themselves on his behalf, he escaped into the neighbouring thicket. Ten Roman legions soon followed the cavalry. At the same time a summons was issued to the surrounding tribes to hunt the outlawed Eburones and pillage their land in concert with the Roman soldiers; not a few complied with the call, including even an audacious band of Sugambrian horsemen from the other side of the Rhine, who for that matter treated the Romans no better than the Eburones, and had almost by a daring coup de main surprised the Roman camp at Aduatuca.
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Reference address : http://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=106