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
Roman Intervention - Treaty between Rome and Numidia
A cry of indignation rose throughout Italy. The minority in the senate itself and every one out of the senate unanimously condemned the government, with whom the honour and interest of the country seemed mere commodities for sale; loudest of all was the outcry of the mercantile class, which was most directly affected by the sacrifice of the Roman and Italian merchants at Cirta. It is true that the majority of the senate still even now struggled; they appealed to the class-interests of the aristocracy, and set in motion all the contrivances of collegiate procrastination, with a view to preserve still longer the peace which they loved.
But when Gaius Memmius, designated as tribune of the people for next year, an active and eloquent man, brought the matter publicly forward and threatened in his capacity of tribune to call the worst offenders to judicial account, the senate permitted war to be declared against Jugurtha (642-3). The step seemed taken in earnest. The envoys of Jugurtha were dismissed from Italy without being admitted to an audience; the new consul Lucius Calpurnius Bestia, who was distinguished, among the members of his order at least, by judgment and activity, prosecuted the warlike preparations with energy; Marcus Scaurus himself took the post of a commander in the African army.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=34