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
Internal Dissension among the Sertorians
The discomfiture sustained by the arms of the insurgents failed not to react on the tone of feeling in their camp. The military successes of Sertorius became like those of Hannibal, of necessity less and less considerable; people began to call in question his military talent: he was no longer, it was alleged, what he had been; he spent the day in feasting or over his cups, and squandered money as well as time. The number of the deserters, and of communities falling away, increased.
Soon projects formed by the Roman emigrants against the life of the general were reported to him; they sounded credible enough, especially as various officers of the insurgent army, and Perpenna in particular, had submitted with reluctance to the supremacy of Sertorius, and the Roman governors had for long promised amnesty and a high reward to any one who should kill him. Sertorius, on hearing such allegations, withdrew the charge of guarding his person from the Roman soldiers and entrusted it to select Spaniards.
Against the suspected themselves he proceeded with fearful but necessary severity, and condemned various of the accused to death without resorting, as in other cases, to the advice of his council; he was now more dangerous--it was thereupon affirmed in the circles of the malcontents--to his friends than to his foes.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=53