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
Outbreak of the War - Lepidus Defeated - Death of Lepidus
Thus war was declared. The senatorial party could reckon, in addition to the Sullan veterans whose civil existence was threatened by Lepidus, upon the army assembled by the proconsul Catulus; and so, in compliance with the urgent warnings of the more sagacious, particularly of Philippus, Catulus was entrusted by the senate with the defence of the capital and the repelling of the main force of the democratic party stationed in Etruria. At the same time Gnaeus Pompeius was despatched with another corps to wrest from his former protege the valley of the Po, which was held by Lepidus' lieutenant, Marcus Brutus.
While Pompeius speedily accomplished his commission and shut up the enemy's general closely in Mutina, Lepidus appeared before the capital in order to conquer it for the revolution as Marius had formerly done by storm. The right bank of the Tiber fell wholly into his power, and he was able even to cross the river. The decisive battle was fought on the Campus Martius, close under the walls of the city. But Catulus conquered; and Lepidus was compelled to retreat to Etruria, while another division, under his son Scipio, threw itself into the fortress of Alba. Thereupon the rising was substantially atan end.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=37