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
Suppression of the Etruscan Insurrection
After the conspiracy had been thus stifled in the capital even before it came to an outbreak, there remained the task of putting an end to the insurrection in Etruria. The army amounting to about 2000 men, which Catilina found on his arrival, had increased nearly fivefold by the numerous recruits who flocked in, and already formed two tolerably full legions, in which however only about a fourth part of the men were sufficiently armed. Catilina had thrown himself with his force into the mountains and avoided a battle with the troops of Antonius, with the view of completing the organization of his bands and awaiting the outbreak of the insurrection in Rome.
But the news of its failure broke up the army of the insurgents; the mass of the less compromised thereupon returned home. The remnant of resolute, or rather desperate, men that were left made an attempt to cut their way through the Apennine passes into Gaul; but when the little band arrived at the foot of the mountains near Pistoria (Pistoja), it found itself here caught between two armies. In front of it was the corps of Quintus Metellus, which had come up from Ravenna and Ariminum to occupy the northern slope of the Apennines; behind it was the army of Antonius, who had at length yielded to the urgency of his officers and agreed to a winter campaign.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=40