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
When the new commander-in-chief, the consul Lucius Lucullus, arrived at head-quarters, he found the war which he had come to conduct already terminated by a formally concluded peace, and his hopes of bringing home honour and more especially money from Spain were apparently frustrated. But there was a means of surmounting this difficulty. Lucullus of his own accord attacked the western neighbours of the Arevacae, the Vaccaei, a Celtiberian nation still independent which was living on the best understanding with the Romans.
The question of the Spaniards as to what fault they had committed was answered by a sudden attack on the town of Cauca (Coca, eight Spanish leagues to the west of Segovia); and, while the terrified town believed that it had purchased a capitulation by heavy sacrifices of money, Roman troops marched in and enslaved or slaughtered the inhabitants without any pretext at all. After this heroic feat, which is said to have cost the lives of some 20,000 defenceless men, the army proceeded on its march.
Far and wide the villages and townships were abandoned or, as in the case of the strong Intercatia and Pallantia (Palencia) the capital of the Vaccaei, closed their gates against the Roman army. Covetousness was caught in its own net; there was no community that would venture to conclude a capitulation with the perfidious commander, and the general flight of the inhabitants not only rendered booty scarce, but made it almost impossible for him to remain for any length of time in these inhospitable regions.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=10