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
Etruscans Driven Back from Latium - Fall of the Etrusco-Carthaginian Maritime Supremacy - Victories of Salamis and Himera, and Their Effects
But the subjugation, with which the coalition of the Etruscan and Carthaginian nations had threatened both Greeks and Italians, was fortunately averted by the combination of peoples drawn towards each other by family affinity as well as by common peril. The Etruscan army, which after the fall of Rome had penetrated into Latium, had its victorious career checked in the first instance before the walls of Aricia by the well-timed intervention of the Cumaeans who had hastened to the succour of the Aricines (248).
We know not how the war ended, nor, in particular, whether Rome even at that time tore up the ruinous and disgraceful peace. This much only is certain, that on this occasion also the Tuscans were unable to maintain their ground permanently on the left bank of the Tiber.
Soon the Greek nation was forced to engage in a still more comprehensive and still more decisive conflict with the barbarians both of the west and of the east. It was about the time of the Persian wars. The relation in which the Tyrians stood to the great king led Carthage also to follow in the wake of Persian policy --there exists a credible tradition even as to an alliance between the Carthaginians and Xerxes--and, along with the Carthaginians, the Etruscans.
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Reference address : http://www.ellopos.net/elpenor/rome/2-04-fall-etruscan-celts.asp?pg=3