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
It was of at least equal importance, that on this news the Belgae, who had hitherto kept aloof from the whole movement, began to bestir themselves. The powerful canton of the Bellovaci rose with the view of attacking in the rear the corps of Labienus, while it confronted at Lutetia the levy of the surrounding cantons of central Gaul. Everywhere else too men were taking to arms; the strength of patriotic enthusiasm carried along with it even the most decided and most favoured partisans of Rome, such as Commius king of the Atrebates, who on account of his faithful services had received from the Romans important privileges for his community and the hegemony over the Morini.
The threads of the insurrection ramified even into the old Roman province: they cherished the hope, perhaps not without ground, of inducing the Allobroges themselves to take arms against the Romans. With the single exception of the Remi and of the districts--dependent immediately on the Remi-- of the Suessiones, Leuci, and Lingones, whose peculiar isolation was not affected even amidst this general enthusiasm, the whole Celtic nation from the Pyrenees to the Rhine was now in reality, for the first and for the last time, in arms for its freedom and nationality; whereas, singularly enough, the whole German communities, who in the former struggles had held the foremost rank, kept aloof. In fact, the Treveri, and as it would seem the Menapii also, were prevented by their feuds with the Germans from taking an active part in the national war.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=123