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
The Volscians opposed a more serious resistance. The first notable success, after those mentioned above, achieved over them by the Romans was, remarkably enough, the foundation of Circeii in 361, which, as long as Antium and Tarracina continued free, can only have held communication with Latium by sea. Attempts were often made to occupy Antium, and one was temporarily successful in 287; but in 295 the town recovered its freedom, and it was not till after the Gallic conflagration that, in consequence of a violent war of thirteen years (365-377), the Romans gained a decided superiority in the Antiate and Pomptine territory. Satricum, not far from Antium, was occupied with a Latin colony in 369, and not long afterwards probably Antium itself as well as Tarracina.(13)
13. The two do not appear as Latin colonies in the so-called Cassian list about 372, but they so appear in the Carthaginian treaty of 406; the towns had thus become Latin colonies in the interval.
The Pomptine territory was secured by the founding of the fortress Setia (372, strengthened in 375), and was distributed into farm-allotments and burgess-districts in the year 371 and following years. After this date the Volscians still perhaps rose in revolt, but they waged no further wars against Rome.
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Reference address : http://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=12