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 Last Conflicts - With the Bituriges and Carnutes
The fall of Alesia and the capitulation of the army enclosed in it were fearful blows for the Celtic insurrection; but blows quite as heavy had befallen the nation and yet the conflict had been renewed. The loss of Vercingetorix, however, was irreparable. With him unity had come to the nation; with him it seemed also to have departed. We do not find that the insurgents made any attempt to continue their joint defence and to appoint another generalissimo; the league of patriots fell to pieces of itself, and every clan was left to fight or come to terms with the Romans as it pleased. Naturally the desire after rest everywhere prevailed. Caesar too had an interest in bringing the war quickly to an end.
Of the ten years of his governorship seven had elapsed, and the last was called in question by his political opponents in the capital; he could only reckon with some degree of certainty on two more summers, and, while his interest as well as his honour required that he should hand over the newly-acquired regions to his successor in a condition of tolerable peace and tranquillity, there was in truth but scanty time to bring about such a state of things. To exercise mercy was in this case still more a necessity for the victor than for the vanquished; and he might thank his stars that the internal dissensions and the easy temperament of the Celts met him in this respect half way.
Where--as in the two most eminent cantons of central Gaul, those of the Haedui and Arverni--there existed a strong party well disposed to Rome, the cantons obtained immediately after the fall of Alesia a complete restoration of their former relations with Rome, and even their captives, 20,000 in number, were released without ransom, while those of the other clans passed into the hard bondage of the victorious legionaries. The greater portion of the Gallic districts submitted like the Haedui and Arverni to their fate, and allowed their inevitable punishment to be inflicted without farther resistance. But not a few clung in foolish frivolity or sullen despair to the lost cause, till the Roman troops of execution appeared within their borders. Such expeditions were in the winter of 702-703 undertaken against the Bituriges and the Carnutes.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=131