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 Conspiracy of the Patriots
The work of repelling the Germanic invasion and of subduing the continental Celts was completed. But it is often easier to subdue a free nation than to keep a subdued one in subjection. The rivalry for the hegemony, by which more even than by the attacks of Rome the Celtic nation had been ruined, was in some measure set aside by the conquest, inasmuch as the conqueror took the hegemony to himself. Separate interests were silent; under the common oppression at any rate they felt themselves again as one people; and the infinite value of that which they had with indifference gambled away when they possessed it--freedom and nationality-- was now, when it was too late, fully appreciated by their infinite longing. But was it, then, too late?
With indignant shame they confessed to themselves that a nation, which numbered at least a million of men capable of arms, a nation of ancient and well- founded warlike renown, had allowed the yoke to be imposed upon it by, at the most, 50,000 Romans. The submission of the confederacy of central Gaul without having struck even a blow; the submission of the Belgic confederacy without having done more than merely shown a wish to strike; the heroic fall on the other hand of the Nervii and the Veneti, the sagacious and successful resistance of the Morini, and of the Britons under Cassivellaunus-- all that in each case had been done or neglected, had failed or had succeeded--spurred the minds of the patriots to new attempts, if possible, more united and more successful.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=96