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
Conflicts in Picenum
Everything depended on whether Picenum would hold out until Pompeius should come up to its defence. Already Caesar with his reunited army had penetrated into it along the coast road by way of Ancona. Here too the preparations were in full course; in the very northernmost Picenian town Auximum a considerable band of recruits was collected under Publius Attius Varus; but at the entreaty of the municipality Varus evacuated the town even before Caesar appeared, and a handful of Caesar's soldiers which overtook the troop not far from Auximum totally dispersed it after a brief conflict-- the first in this war. In like manner soon afterwards Gaius Lucilius Hirrus with 3000 men evacuated Camerinum, and Publius Lentulus Spinther with 5000 Asculum.
The men, thoroughly devoted to Pompeius, willingly for the most part abandoned their houses and farms, and followed their leaders over the frontier; but the district itself was already lost, when the officer sent by Pompeius for the temporary conduct of the defence, Lucius Vibullius Rufus--no genteel senator, but a soldier experienced in war--arrived there; he had to content himself with taking the six or seven thousand recruits who were saved away from the incapable recruiting officers, and conducting them for the time to the nearest rendezvous.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=22