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
Even the Roman government began at length to perceive that matters could no longer continue on this footing; they resolved to entrust the subjugation of the small Spanish country-town, as an extraordinary measure, to the first general of Rome, Scipio Aemilianus. The pecuniary means for carrying on the war were indeed doled out to him with preposterous parsimony, and the permission to levy soldiers, which he asked, was even directly refused--a result towards which coterie- intrigues and the fear of being burdensome to the sovereign people may have co-operated.
But a great number of friends and clients voluntarily accompanied him; among them was his brother Maximus Aemilianus, whosome years before had commanded with distinction against Viriathus. Supported by this trusty band, which was formed into a guard for the general, Scipio began to reorganize the deeply disordered army (620). First of all, the camp-followers had to take their departure--there were found as many as 2000 courtesans, and an endless number of soothsayers and priests of all sorts--and, if the soldier was not available for fighting, he had at least to work in the trenches and to march.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=24