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
Renewed Insurrection - Rising of the Haedui - Rising of the Belgae
The imposing position of Caesar in Gaul depended essentially on the halo of victory that surrounded him; and this began to grow pale. The conflicts around Avaricum, Caesar's vain attempts to compel the enemy to fight, the resolute defence of the city and its almost accidental capture by storm bore a stamp different from that of the earlier Celtic wars, and had strengthened rather than impaired the confidence of the Celts in themselves and their leader. Moreover, the new system of warfare--the making head against the enemy in intrenched camps under the protection of fortresses--had completely approved itself at Lutetia as well as at Gergovia.
Lastly, this defeat, the first which Caesar in person had suffered from the Celts crowned their success, and it accordingly gave as it were the signal for a second outbreak of the insurrection. The Haedui now broke formally with Caesar and entered into union with Vercingetorix. Their contingent, which was still with Caesar's army, not only deserted from it, but also took occasion to carry off the depots of the army of Caesar at Noviodunum on the Loire, whereby the chests and magazines, a number of remount-horses, and all the hostages furnished to Caesar, fell into the hands of the insurgents.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=122