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
War in Picenum - Asculum Besieged - And Conquered - Subjugation of the Sabellians and Marsians
Thus began the second campaign in 665. The insurgents opened it, even before winter was over, by the bold attempt--recalling the grand passages of the Samnite wars--to send a Marsian army of 15,000 men to Etruria with a view to aid the insurrection brewing in Northern Italy. But Strabo, through whose district it had to pass, intercepted and totally defeated it; only a few got back to their far distant home.
When at length the season allowed the Roman armies to assume the offensive, Cato entered the Marsian territory and advanced, successfully encountering the enemy there; but he fell in the region of the Fucine lake during an attack on the enemy's camp, so that the exclusive superintendence of the operations in Central Italy devolved on Strabo. The latter employed himself partly in continuing the siege of Asculum, partly in the subjugation of the Marsian, Sabellian, and Apulian districts.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=44