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
Thereupon Nobilior appeared in Hither Spain with an army of nearly 30,000 men, including some Numidian horsemen and ten elephants. The walls of the new town of Segeda still stood unfinished: most of the inhabitants submitted. But the most resolute men fled with their wives and children to the powerful Arevacae, and summoned these to make common cause with them against the Romans. The Arevacae, emboldened by the victory of the Lusitanians over Mummius, consented, and chose Carus, one of the Segedan refugees, as their general.
On the third day after his election the valiant leader had fallen, but the Roman army was defeated and nearly 6000 Roman burgesses were slain; the 23rd day of August, the festival of the Volcanalia, was thenceforth held in sad remembrance by the Romans. The fall of their general, however, induced the Arevacae to retreat into their strongest town Numantia (Guarray, a Spanish league to the north of Soria on the Douro), whither Nobilior followed them. Under the walls of the town a second engagement took place, in which the Romans at first by means of their elephants drove the Spaniards back into the town; but while doing so they were thrown into confusion in consequence of one of the animals being wounded, and sustained a second defeat at the hands of the enemy again issuing from the walls.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=6