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
Character of Those Leagues
The impulse of the nation towards freedom found doubtless a certain gratification in these cantonal unions; but they were in every respect unsatisfactory. The union was of the loosest kind, constantly fluctuating between alliance and hegemony; the representation of the whole body in peace by the federal diets, in war by the general,(21) was in the highest degree feeble.
21. The position which such a federal general occupied with reference to his troops, is shown by the accusation of high treason raised against Vercingetorix (Caesar, B. G. vii. 20).
The Belgian confederacy alone seems to have been bound together somewhat more firmly; the national enthusiasm, from which the successful repulse of the Cimbri proceeded,(22) may have proved beneficial to it.
22. Cf. IV. V. The Cimbri
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=36