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
While the conflict was proceeding thus warmly and with varying success at the Fucine lake, the Picenian corps under Strabo had also fought with alternations of fortune. The insurgent chiefs, Gaius Iudacilius from Asculum, Publius Vettius Scato, and Titus Lafrenius, had assailed it with their united forces, defeated it, and compelled it to throw itself into Firmum, where Lafrenius kept Strabo besieged, while Iudacilius moved into Apulia and induced Canusium, Venusia, and the other towns still adhering to Rome in that quarter to join the insurgents.
But on the Roman side Servius Sulpicius by his victory over the Paeligni cleared the way for his advancing into Picenum and rendering aid to Strabo; Lafrenius was attacked by Strabo in front and taken in rear by Sulpicius, and his camp was set on fire; he himself fell, the remnant of his troops fled in disorder and threw themselves into Asculum. So completely had the state of affairs changed in Picenum, that the Italians now found themselves confined to Asculum as the Romans were previously to Firmum, and the war was thus once more converted into a siege.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=33