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 the second great city on the east coast, Messana, a band of foreign soldiers had established themselves and held the city, independent alike of Syracusans and Carthaginians. These new rulers of Messana were Campanian mercenaries. The dissolute habits that had become prevalent among the Sabellians settled in and around Capua,(1) had made Campania in the fourth and fifth centuries--what Aetolia, Crete, and Laconia were afterwards--the universal recruiting field for princes and cities in search of mercenaries.
1. Cf. II. V. Campanian Hellenism
The semi-culture that had been called into existence there by the Campanian Greeks, the barbaric luxury of life in Capua and the other Campanian cities, the political impotence to which the hegemony of Rome condemned them, while yet its rule was not so stern as wholly to withdraw from them the right of self-disposal--all tended to drive the youth of Campania in troops to the standards of the recruiting officers. As a matter of course, this wanton and unscrupulous selling of themselves here, as everywhere, brought in its train estrangement from their native land, habits of violence and military disorder, and indifference to the breach of their allegiance.
These Campanians could see no reason why a band of mercenaries should not seize on their own behalf any city entrusted to their guardianship, provided only they were in a position to hold it--the Samnites had established their dominion in Capua itself, and the Lucanians in a succession of Greek cities, after a fashion not much more honourable.
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Reference address : https://www.ellopos.net/elpenor/rome/3-02-war-rome-carthage-sicily.asp?pg=2