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
Nor was this all. The agricultural villages of the surrounding region--agriculture appears to have been introduced among the Libyans at a very early period, probably anterior to the Phoenician settlement, and presumably from Egypt--were subdued by force of arms, and the free Libyan farmers were transformed into fellahs, who paid to their lords a fourth part of the produce of the soil as tribute, and were subjected to a regular system of recruiting for the formation of a home Carthaginian army.
Hostilities were constantly occurring with the roving pastoral tribes (νομάδες) on the borders; but a chain of fortified posts secured the territory enclosed by them, and the Nomades were slowly driven back into the deserts and mountains, or were compelled to recognize Carthaginian supremacy, to pay tribute, and to furnish contingents.
About the period of the first Punic war their great town Theveste (Tebessa, at the sources of the Mejerda) was conquered by the Carthaginians. These formed the "towns and tribes (ἔθνη) of subjects," which appear in the Carthaginian state-treaties; the former being the non-free Libyan villages, the latter the subject Nomades.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=13