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
After the first conflicts had again issued favourably for the Lusitanians, the prudent general kept together his troops for the remainder of the year in the camp at Urso (Osuna, south-east from Seville) without accepting the enemy's offer of battle, and only took the field afresh in the following year (610), after his troops had by petty warfare become qualified for fighting; he was then enabled to maintain the superiority, and after successful feats of arms went into winter quarters at Corduba. But when the cowardly and incapable praetor Quinctius took the command in room of Maximus, the Romans again suffered defeat after defeat, and their general in the middle of summer shut himself up in Corduba, while the bands of Viriathus overran the southern province (611).
His successor, Quintus Fabius Maximus Servilianus, the adopted brother of Maximus Aemilianus, sent to the peninsula with two fresh legions and ten elephants, endeavoured to penetrate into the Lusitanian country, but after a series of indecisive conflicts and an assault on the Roman camp, which was with difficulty repulsed, found himself compelled to retreat to the Roman territory. Viriathus followed him into the province, but as his troops after the wont of Spanish insurrectionary armies suddenly melted away, he was obliged to return to Lusitania (612). Next year (613) Servilianus resumed the offensive, traversed the districts on the Baetis and Anas, and then advancing into Lusitania occupied a number of townships. A large number of the insurgents fell into his hands; the leaders--of whom there were about 500--were executed; those who had gone over from Roman territory to the enemy had their hands cut off; the remaining mass were sold into slavery.
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Reference address : http://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=16