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
The struggle with the Hernici was more severe (392-396); the first
consular commander-in-chief belonging to the plebs, Lucius Genucius,
fell in it; but here too the Romans were victorious. The crisis
terminated with the renewal of the treaties between Rome and the Latin
and Hernican confederacies in 396.
The precise contents of these
treaties are not known, but it is evident that both confederacies
submitted once more, and probably on harder terms, to the Roman
hegemony. The institution which took place in the same year of two
new tribes in the Pomptine territory shows clearly the mighty
advances made by the Roman power.