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
One behest after another was issued to the Lusitanians, each successive demand more intolerable than its predecessors; and at length they were required even to surrender their arms. Then Viriathus recollected the fate of his countrymen whom Galba had caused to be disarmed, and grasped his sword afresh. But it was too late. His wavering had sown the seeds of treachery among those who were immediately around him; three of his confidants, Audas, Ditalco, and Minucius from Urso, despairing of the possibility of renewed victory, procured from the king permission once more to enter into negotiations for peace with Caepio, and employed it for the purpose of selling the life of the Lusitanian hero to the foreigners in return for the assurance of personal amnesty and further rewards.
On their return to the camp they assured the king of the favourable issue of their negotiations, and in the following night stabbed him while asleep in his tent. The Lusitanians honoured the illustrious chief by an unparalleled funeral solemnity at which two hundred pairs of champions fought in the funeral games; and still more highly by the fact, that they did not renounce the struggle, but nominated Tautamus as their commander- in-chief in room of the fallen hero.
The plan projected by the latter for wresting Saguntum from the Romans was sufficiently bold; but the new general possessed neither the wise moderation nor the military skill of his predecessor. The expedition utterly broke down, and the army on its return was attacked in crossing the Baetis and compelled to surrender unconditionally. Thus was Lusitania subdued, far more by treachery and assassination on the part of foreigners and natives than by honourable war.
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Reference address : http://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=18