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
Domination of the Romans; Exasperation of the Latins - Collision between the Romans and the Samnites
After the fall of Veii and the conquest of the Pomptine territory, Rome evidently felt herself powerful enough to tighten the reins of her hegemony and to reduce the whole of the Latin cities to a position so dependent that they became in fact completely subject. At this period (406) the Carthaginians, in a commercial treaty concluded with Rome, bound themselves to inflict no injury on the Latins who were subject to Rome, viz. the maritime towns of Ardea, Antium, Circeii, and Tarracina; if, however, any one of the Latin towns should fall away from the Roman alliance, the Phoenicians were to be allowed to attack it, but in the event of conquering it they were bound not to raze it, but to hand it over to the Romans. This plainly shows by what chains the Roman community bound to itself the towns protected by it and how much a town, which dared to withdraw from the native protectorate, sacrificed or risked by such a course.
It is true that even now the Latin confederacy at least--if not also the Hernican--retained its formal title to a third of the gains of war, and doubtless some other remnants of the former equality of rights; but what was palpably lost was important enough to explain the exasperation which at this period prevailed among the Latins against Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=21