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
Not only did numerous Latin volunteers fight under foreign standards against the community at their head, wherever they found armies in the field against Rome; but in 405 even the Latin federal assembly resolved to refuse to the Romans its contingent. To all appearance a renewed rising of the whole Latin confederacy might be anticipated at no distant date; and at that very moment a collision was imminent with another Italian nation, which was able to encounter on equal terms the united strength of the Latin stock.
After the overthrow of the northern Volscians no considerable people in the first instance opposed the Romans in the south; their legions unchecked approached the Liris. As early as 397 they had contended; successfully with the Privernates; and in 409 occupied Sora on the upper Liris.
Thus the Roman armies had reached the Samnite frontier; and the friendly alliance, which the two bravest and most powerful of the Italian nations concluded with each other in 400, was the sure token of an approaching struggle for the supremacy of Italy--a struggle which threatened to become interwoven with the crisis within the Latin nation.
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Reference address : https://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=22