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
In all haste 5000 men of the Spanish militia were despatched from the Ebro to reinforce the defeated Romans; but Viriathus destroyed the corps while still on its march, and commanded so absolutely the whole interior of Carpetania that the Romans did not even venture to seek him there. Viriathus, now recognized as lord and king of all the Lusitanians, knew how to combine the full dignity of his princely position with the homely habits of a shepherd. No badge distinguished him from the common soldier: he rose from the richly adorned marriage- table of his father-in-law, the prince Astolpa in Roman Spain, without having touched the golden plate and the sumptuous fare, lifted his bride on horseback, and rode back with her to his mountains.
He never took more of the spoil than the share which he allotted to each of his comrades. The soldier recognized the general simply by his tall figure, by his striking sallies of wit, and above all by the fact that he surpassed every one of his men in temperance as well as in toil, sleeping always in full armour and fighting in front of all in battle. It seemed as if in that thoroughly prosaic age one of the Homeric heroes had reappeared: the name of Viriathus resounded far and wide through Spain; and the brave nation conceived that in him it had at length found the man who was destined to break the fetters of alien domination.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=14