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
Schemes for Appointing a Democratic Military Dictatorship
In this policy they again coincided with Crassus, to whom no course was left for encountering his envied and hated rival but that of allying himself afresh, and more closely than before, with the democracy. Already in the first coalition a special approximation had taken place between Caesar and Crassus as the two weaker parties; a common interest and a common danger tightened yet more the bond which joined the richest and the most insolvent of Romans in closest alliance.
While in public the democrats described the absent general as the head and pride of their party and seemed to direct all their arrows against the aristocracy, preparations were secretly made against Pompeius; and these attempts of the democracy to escape from the impending military dictatorship have historically a far higher significance than the noisy agitation, for the most part employed only as a mask, against the nobility. It is true that they were carried on amidst a darkness, upon which our tradition allows only some stray gleams of light to fall; for not the present alone, but the succeeding age also had its reasons for throwing a veil over the matter.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=13