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
Caesar's Plan of War - Caesar Unites with Labienus
It was a grave and decisive moment, when after the retreat from Gergovia and the loss of Noviodunum a council of war was held in Caesar's headquarters regarding the measures now to be adopted. Various voices expressed themselves in favour of a retreat over the Cevennes into the old Roman province, which now lay open on all sides to the insurrection and certainly was in urgent need of the legions that had been sent from Rome primarily for its protection. But Caesar rejected this timid strategy suggested not by the position of affairs, but by government-instructions and fear of responsibility.
He contented himself with calling the general levy of the Romans settled in the province to arms, and having the frontiers guarded by that levy to the best of its ability. On the other hand he himself set out in the opposite direction and advanced by forced marches to Agedincum, to which he ordered Labienus to retreat in all haste. The Celts naturally endeavoured to prevent the junction of the two Roman armies. Labienus might by crossing the Marne and marching down the right bank of the Seine have reached Agedincum, where he had left his reserve and his baggage; but he preferred not to allow the Celts again to behold the retreat of Roman troops.
He therefore instead of crossing the Marne crossed the Seine under the eyes of the deluded enemy, and on its left bank fought a battle with the hostile forces, in which he conquered, and among many others the Celtic general himself, the old Camulogenus, was left on the field. Nor were the insurgents more successful in detaining Caesar on the Loire; Caesar gave them no time to assemble larger masses there, and without difficulty dispersed the militia of the Haedui, which alone he found at that point
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=124