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
Retirement of Pompeius
But the democrats averted this catastrophe by their sagacity and their pliancy. For their party too, as well as for the senate and Crassus, it was all-important that Pompeius should not seize the dictatorship; but with a truer discernment of their own weakness and of the character of their powerful opponent their leaders tried the method of conciliation. Pompeius lacked no condition for grasping at the crown except the first of all--proper kingly courage. We have already described the man--with his effort to be at once loyal republican and master of Rome, with his vacillation and indecision, with his pliancy that concealed itself under the boasting of independent resolution.
This was the first great trial to which destiny subjected him; and he failed to stand it. The pretext under which Pompeius refused to dismiss the army was, that he distrusted Crassus and therefore could not take the initiative in disbanding the soldiers. The democrats induced Crassus to make gracious advances in the matter, and to offer the hand of peace to his colleague before the eyes of all; in public and in private they besought the latter that to the double merit of having vanquished the enemy and reconciled the parties he would add the third and yet greater service of preserving internal peace to his country, and banishing the fearful spectre of civil war with which they were threatened.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=19