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
The winter was drawing to a close when Caesar set out with his army, which meanwhile had been considerably reinforced, against the insurgents. The attempts of the Treveri to concentrate the revolt had not succeeded; the agitated districts were kept in check by the marching in of Roman troops, and those in open rebellion were attacked in detail. First the Nervii were routed by Caesar in person. The Senones and Carnutes met the same fate. The Menapii, the only canton which had never submitted to the Romans, were compelled by a grand attack simultaneously directed against them from three sides to renounce their long-preserved freedom. Labienus meanwhile was preparing the same fate for the Treveri.
Their first attack had been paralyzed, partly by the refusal of the adjoining German tribes to furnish them with mercenaries, partly by the fact that Indutiomarus, the soul of the whole movement had fallen in a skirmish with the cavalry of Labienus. But they did not on this account abandon their projects. With their whole levy they appeared in front of Labienus and waited for the German bands that were to follow, for their recruiting agents found a better reception than they had met with from the dwellers on the Rhine, among the warlike tribes of the interior of Germany, especially, as it would appear, among the Chatti. But when Labienus seemed as if he wished to avoid these and to march off in all haste, the Treveri attacked the Romans even before the Germans arrived and in a most unfavourable spot, and were completely defeated.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=104