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
Impending Miliatry Dictatorship of Pompeius
The work of Sulla was thus destroyed; but what the future order of things was to be, was a question raised rather than decided by that destruction. The coalition, kept together solely by the common object of setting aside the work of restoration, dissolved of itself, if not formally, at any rate in reality, when that object was attained; while the question, to what quarter the preponderance of power was in the first instance to fall, seemed approaching an equally speedy and violent solution. The armies of Pompeius and Crassus still lay before the gates of the city.
The former had indeed promised to disband his soldiers after his triumph (last day of Dec. 683); but he had at first omitted to do so, in order to let the revolution in the state be completed without hindrance under the pressure which the Spanish army in front of the capital exercised over the city and the senate--a course, which in like manner applied to the army of Crassus. This reason now existed no longer; but still the dissolution of the armies was postponed. In the turn taken by matters it looked as if one of the two generals allied with the democracy would seize the military dictatorship and place oligarchs and democrats in the same chains. And this one could only be Pompeius.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=17