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
They determined to break up and go home; though for honour's sake all the cantons at the same time bound themselves to hasten with their united strength to the help of the one first attacked, the miserable dispersion of the confederacy was but miserably palliated by such impracticable stipulations. It was a catastrophe which vividly reminds us of that which occurred almost on the same spot in 1792; and, just as with the campaign in Champagne, the defeat was all the more severe that it took place without a battle.
The bad leadership of the retreating army allowed the Roman general to pursue it as if it were beaten, and to destroy a portion of the contingents that had remained to the last. But the consequences of the victory were not confined to this. As Caesar advanced into the western cantons of the Belgae, one after another gave themselves up as lost almost without resistance; the powerful Suessiones (about Soissons), as well as their rivals, the Bellovaci (about Beauvais) and the Ambiani (about Amiens). The towns opened their gates when they saw the strange besieging machines, the towers rolling up to their walls; those who would not submit to the foreign masters sought a refuge beyond the sea in Britain.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=76