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
Even if people were not more favourably disposed towards the government in itself than before, yet, after having found themselves, although but for a moment, on the verge of a real mob-rule, all men who had anything to lose viewed the existing government in a different light; it was notoriously wretched and pernicious for the state, but the anxious dread of the still more wretched and still more pernicious government of the proletariate had conferred on it a relative value.
The current now set so much in that direction that the multitude tore in pieces a tribune of the people who had ventured to postpone the return of Quintus Metellus, and the democrats began to seek their safety in league with murderers and poisoners--ridding themselves, for example, of the hated Metellus by poison--or even in league with the public enemy, several of them already taking refuge at the court of king Mithradates who was secretly preparing for war against Rome. External relations also assumed an aspect favourable for the government. The Roman arms were employed but little in the period from the Cimbrian to the Social war, but everywhere with honour.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=36