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
At the very outset one of his divisions broke up entirely, so that the fugitives did not fall back on the main corps, but went straight home. Thereupon, when the order was given to advance against the enemy's entrenchments and attack them, the greater portion of the troops refused to comply with it. Nevertheless Varinius set out with those who kept their ground against the robber-band; but it was no longer to be found where he sought it. It had broken up in the deepest silence and had turned to the south towards Picentia (Vicenza near Amain), where Varinius overtook it indeed, but could not prevent it from retiring over the Silarus into the interior of Lucania, the chosen land of shepherds and robbers. Varinius followed thither, and there at length the despised enemy arrayed themselves for battle.
All the circumstances under which the combat took place were to the disadvantage of the Romans: the soldiers, vehemently as they had demanded battle a little before, fought ill; Varinius was completely vanquished; his horse and the insignia of his official dignity fell with the Roman camp itself into the enemy's hand. The south-Italian slaves, especially the brave half-savage herdsmen, flocked in crowds to the banner of the deliverers who had so unexpectedly appeared; according to the most moderate estimates the number of armed insurgents rose to 40,000 men.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=72