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
Extraordinary successes in northern and in southern Spain marked the next years of his generalship. After destroying the vanguard of the praetor Gaius Plautius (608-9), Viriathus had the skill to lure him over to the right bank of the Tagus, and there to defeat him so emphatically that the Roman general went into winter quarters in the middle of summer--on which account he was afterwards charged before the people with having disgraced the Roman community, and was compelled to live in exile. In like manner the army of the governor-- apparently of the Hither province--Claudius Unimanus was destroyed, that of Gaius Negidius was vanquished, and the level country was pillaged far and wide.
Trophies of victory, decorated with the insignia of the Roman governors and the arms of the legions, were erected on the Spanish mountains; people at Rome heard with shame and consternation of the victories of the barbarian king. The conduct of the Spanish war was now committed to a trustworthy officer, the consul Quintus Fabius Maximus Aemilianus, the second son of the victor of Pydna (609). But the Romans no longer ventured to send the experienced veterans, who bad just returned from Macedonia and Asia, forth anew tothe detested Spanish war; the two legions, which Maximus brought with him, were new levies and scarcely more to be trusted than the old utterly demoralized Spanish army.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=15