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
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.
