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
It was impossible to adopt a more irrational course. The senate, in presence of the insurrection, evinced its pusillanimity and its fears by the re-establishment of the corn-law; in order to be relieved from a street-riot, it furnished the notorious head of the insurrection with an army; and, when the two consuls were bound by the most solemn oath which could be contrived not to turn the arms entrusted to them against each other, it must have required the superhuman obduracy of oligarchic consciences to think of erecting such a bulwark against the impending insurrection. Of course Lepidus armed in Etruria not for the senate, but for the insurrection-- sarcastically declaring that the oath which he had taken bound him only for the current year.
The senate put the oracular machinery in motion to induce him to return, and committed to him the conduct of the impending consular elections; but Lepidus evaded compliance, and, while messengers passed to and fro and the official year drew to an end amidst proposals of accommodation, his force swelled to an army. When at length, in the beginning of the following year (677), the definite order of the senate was issued to Lepidus to return without delay, the proconsul haughtily refused obedience, and demanded in his turn the renewal of the former tribunician power, the reinstatement of those who had been forcibly ejected from their civic rights and their property, and, besides this, his own re-election as consul for the current year or, in other words, the -tyrannis- in legal form.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=36