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
But on this occasion also the Spanish war proved true to its fickle and capricious character. After all these successes the Roman army was attacked by Viriathus while it was besieging Erisane, defeated, and driven to a rock where it was wholly in the power of the enemy. Viriathus, however, was content, like the Samnite general formerly at the Caudine passes, to conclude a peace with Servilianus, in which the community of the Lusitanians was recognized as sovereign and Viriathus acknowledged as its king. The power of the Romans had not risen more than the national sense of honour had sunk; in the capital men were glad to be rid of the irksome war, and the senate and people ratified the treaty.
But Quintus Servilius Caepio, the full brother of Servilianus and his successor in office, was far from satisfied with this complaisance; and the senate was weak enough at first to authorize the consul to undertake secret machinations against Viriathus, and then to view at least with indulgence the open breach of his pledged word for which there was no palliation. So Caepio invaded Lusitania, and traversed the land as far as the territories of the Vettones and Callaeci; Viriathus declined a conflict with the superior force, and by dexterous movements evaded his antagonist (614).
But when in the ensuing year (615) Caepio renewed the attack, and in addition the army, which had in The meantime become available in the northern province, made its appearance under Marcus Popillius in Lusitania, Viriathus sued for peace on any terms. He was required to give up to the Romans all who had passed over to him from the Roman territory, amongst whom was his own father-in-law; he did so, and the Romans ordered them to be executed or to have their hands cut off. But this was not sufficient; the Romans were not in the habit of announcing to the vanquished all at once their destined fate.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=17