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
Carthage Heads the Western Phoenicians in Opposition to the Greeks
That the Phoenician stock did not even in Carthage renounce its policy of passiveness, there is no lack of evidence to prove. Carthage paid, even down to the times of its prosperity, a ground-rent for the space occupied by the city to the native Berbers, the tribe of the Maxyes or Maxitani; and although the sea and the desert sufficiently protected the city from any assault of the eastern powers, Carthage appears to have recognized--although but nominally--the supremacy of the great- king, and to have paid tribute to him occasionally, in order to secure its commercial communications with Tyre and the East.
But with all their disposition to be submissive and cringing, circumstances occurred which compelled these Phoenicians to adopt a more energetic policy. The stream of Greek migration was pouring ceaselessly towards the west: it had already dislodged the Phoenicians from Greece proper and Italy, and it was preparing to supplant them also in Sicily, in Spain, and even in Libya itself. The Phoenicians had to make a stand somewhere, if they were not willing to be totally crushed. In this case, where they had to deal with Greek traders and not with the great-king, submission did not suffice to secure the continuance of their commerce and industry on its former footing, liable merely to tax and tribute.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=10