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
Corfinium Besieged - And Captured
This was Corfinium, the place of meeting for the levies in the Albensian, Marsian and Paelignian territories; the body of recruits here assembled, of nearly 15,000 men, was the contingent of the most warlike and trustworthy regions of Italy, and the flower of the army in course of formation for the constitutional party. When Vibullius arrived here, Caesar was still several days' march behind; there was nothing to prevent him from immediately starting agreeably to Pompeius' instructions and conducting the saved Picenian recruits along with those assembled at Corfinium to join the main army in Apulia. But the commandant in Corfinium was the designated successor to Caesar in the governorship of Transalpine Gaul, Lucius Domitius, one of the most narrow-minded and stubborn of the Roman aristocracy; and he not only refused to comply with the orders of Pompeius, but also prevented Vibullius from departing at least with the men from Picenum for Apulia.
So firmly was he persuaded that Pompeius only delayed from obstinacy and must necessarily come up to his relief, that he scarcely made any serious preparations for a siege and did not even gather into Corfinium the bands of recruits placed in the surrounding towns. Pompeius however did not appear, and for good reasons; for, while he might perhaps apply his two untrustworthy legions as a reserved support for the Picenian general levy, he could not with them alone offer battle to Caesar. Instead of him after a few days Caesar came (14 Feb.). His troops had been joined in Picenum by the twelfth, and before Corfinium by the eighth, legion from beyond the Alps, and, besides these, three new legions had been formed partly from the Pompeian men that were taken prisoners or presented themselves voluntarily, partly from the recruits that were at once levied everywhere; so that Caesar before Corfinium was already at the head of an army of 40,000 men, half of whom had seen service.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=23