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
If the counterrevolution in favour of the friends of the constitution, for which all the elements were in existence,(24) did not break out in Italy during Caesar's absence, the reason, according to the assurance of discerning opponents of Caesar, lay chiefly in the general dread of the unbridled fury of the republican ultras after the restoration should have taken place.
24. Cf. V. X. Indignation of the Anarchist Party against Caesar
The better men in the Pompeian camp were in despair over this frantic behaviour. Pompeius, himself a brave soldier, spared the prisoners as far as he might and could; but he was too pusillanimous and in too awkward a position to prevent or even to punish all atrocities of this sort, as it became him as commander-in-chief to do. Marcus Cato, the only man who at least carried moral consistency into the struggle, attempted with more energy to check such proceedings; he induced the emigrant senate to prohibit by a special decree the pillage of subject towns and the putting to death of a burgess otherwise than in battle. The able Marcus Marcellus had similar views. No one, indeed, knew better than Cato and Marcellus that the extreme party would carry out their saving deeds, if necessary, in defiance of all decrees of the senate.
But if even now, when they had still to regard considerations of prudence, the rage of the ultras could not be tamed, people might prepare themselves after the victory for a reign of terror from which Marius and Sulla themselves would have turned away with horror; and we can understand why Cato, according to his own confession, was more afraid of the victory than of the defeat of his own party.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=59