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 Fall of the Revolutionary Party
Their object seemed to be attained; but even now to those who saw more clearly the enterprise could not but appear a failure. The cause of the failure lay mainly in the awkward alliance between a politically incapable general and a street-demagogue, capable but recklessly violent, and filled with passion rather than with the aims of a statesman. They had agreed excellently, so long as the question related only to plans.
But when the plans came to be executed, it was very soon apparent that the celebrated general was in politics utterly incapable; that his ambition was that of the farmer who would cope with and, if possible, surpass the aristocrats in titles, and not that of the statesman who desires to govern because he feels within him the power to do so; that every enterprise, which was based on his personal standing as a politician, must necessarily even under the most favourable circumstances be ruined by himself.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=27