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
It was against Quintus Caepio that their attacks were first
directed; and justly, in so far as he had primarily occasioned the
defeat of Arausio by his insubordination, even apart from the probably
well-founded but not proved charge of embezzling the Tolosan booty;
but the fury which the opposition displayed against him was essentially
augmented by the fact, that he had as consul ventured on an attempt
to wrest the posts of jurymen from the capitalists.(22)
On his account
the old venerable principle, that the sacredness of the magistracy
should be respected even in the person of its worst occupant, was
violated; and, while the censure due to the author of the calamitous
day of Cannae had been silently repressed within the breast, the author
of the defeat of Arausio was by decree of the people unconstitutionally
deprived of his proconsulship, and--what had not occurred since
the crisis in which the monarchy had perished--his property was
confiscated to the state-chest (649?).