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 rivalries for the hegemony made a breach in every league, which time did not close but widened, because the victory of one competitor still left his opponent in possession of political existence, and it always remained open to him, even though he had submitted to clientship, subsequently to renew the struggle.
The rivalry among the more powerful cantons not only set these at variance, but spread into every dependent clan, into every village, often indeed into every house, for each individual chose his side according to his personal relations. As Greece exhausted its strength not so much in the struggle of Athens against Sparta as in the internal strife of the Athenian and Lacedaemonian factions in every dependent community, and even in Athens itself, so the rivalry of the Arverni and Haedui with its repetitions on a smaller and smaller scale destroyed the Celtic people.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=37