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
To the question of the Carthaginians, who was in that case to protect them even against their own emigrants-- against the army, which had swelled to 20,000 men, under the command of Husdrubal who had saved himself from the sentence of death by flight--it was replied, that this would be the concern of the Romans.
Accordingly the council of the city obsequiously appeared before the consuls, with all their fleet-material, all the military stores of the public magazines, all the arms that were found in the possession of private persons--to the number of 3000 catapults and 200,000 sets of armour--and inquired whether anything more was desired.
Then the consul Lucius Marcius Censorinus rose and announced to the council, that in accordance with the instructions given by the senate the existing city was to be destroyed, but that the inhabitants were at liberty to settle anew in their territory wherever they chose, provided it were at a distance of at least ten miles from the sea.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=44