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
Massilia and Cyrene were already founded; the whole east of Sicily was already in the hands of the Greeks; it was full time for the Phoenicians to think of serious resistance. The Carthaginians undertook the task; after long and obstinate wars they set a limit to the advance of the Cyrenaeans, and Hellenism was unable to establish itself to the west of the desert of Tripolis. With Carthaginian aid, moreover, the Phoenician settlers on the western point of Sicily defended themselves against the Greeks, and readily and gladly submitted to the protection of the powerful cognate city.(2)
2. Cf. I. X. Phoenicians and Italians in Opposition to the Greeks
These important successes, which occurred in the second century of Rome, and which saved for the Phoenicians the south- western portion of the Mediterranean, served of themselves to give to the city which had achieved them the hegemony of the nation, and to alter at the same time its political position. Carthage was no longer a mere mercantile city: it aimed at the dominion of Libya and of a part of the Mediterranean, because it could not avoid doing so. It is probable that the custom of employing mercenaries contributed materially to these successes. That custom came into vogue in Greece somewhere about the middle of the fourth century of Rome, but among the Orientals and the Carians more especially it was far older, and it was perhaps the Phoenicians themselves that began it. By the system of foreign recruiting war was converted into a vast pecuniary speculation, which was quite in keeping with the character and habits of the Phoenicians.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=11