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
Metellus led it over the Numidian frontier. When Jugurtha perceived the altered state of things, he gave himself up as lost, and, before the struggle began, made earnest proposals for an accommodation, requesting ultimately nothing more than a guarantee for his life. Metellus, however, was resolved and perhaps even instructed not to terminate the war except with the unconditional subjugation and execution of the daring client-prince; which was in fact the only issue that could satisfy the Romans.
Jugurtha since the victory over Albinus was regarded as the deliverer of Libya from the rule of the hated foreigners; unscrupulous and cunning as he was, and unwieldy as was the Roman government, he might at any time even after a peace rekindle the war in his native country; tranquillity would not be secured, and the removal of the African army would not be possible, until king Jugurtha should cease to exist.
Officially Metellus gave evasive answers to the proposals of the king; secretly he instigated the envoys to deliver their master living or dead to the Romans. But, when the Roman general undertook to compete with the African in the field of assassination, he there met his master; Jugurtha saw through the plan, and, when he could not do otherwise, prepared for a desperate resistance.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=43