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
The Insurrection Takes Shape
The inroads of this little band, numbering at first only seventy-four persons, but rapidly swelling by concourse from the surrounding country, soon became so troublesome to the inhabitants of the rich region of Campania, that these, after having vainly attempted themselves to repel them, sought help against them from Rome. A division of 3000 men hurriedly collected appeared under the leadership of Clodius Glaber, and occupied the approaches to Vesuvius with the view of starving out the slaves. But the brigands in spite of their small number and their defective armament had the boldness to scramble down steep declivities and to fall upon the Roman posts; and when the wretched militia saw the little band of desperadoes unexpectedly assail them, they took to their heels and fled on all sides.
This first success procured for the robbers arms and increased accessions to their ranks. Although even now a great portion of them carried nothing but pointed clubs, the new and stronger division of the militia-- two legions under the praetor Publius Varinius--which advanced from Rome into Campania, found them encamped almost like a regular army in the plain. Varinius had a difficult position. His militia, compelled to bivouac opposite the enemy, were severely weakened by the damp autumn weather and the diseases which it engendered; and, worse than the epidemics, cowardice and insubordination thinned the ranks.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=71