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
Renewed Outbreak of the Samnite-Etruscan War-- Junction of the Troops of the Coalition in Etruria
The high-spirited Samnite nation perceived that such a peace was more ruinous than the most destructive war; and, what was more, it acted accordingly. The Celts in northern Italy were just beginning to bestir themselves again after a long suspension of warfare; moreover several Etruscan communities there were still in arms against the Romans, and brief armistices alternated in that quarter with vehement but indecisive conflicts.
All central Italy was still in ferment and partly in open insurrection; the fortresses were still only in course of construction; the way between Etruria and Samnium was not yet completely closed. Perhaps it was not yet too late to save freedom; but, if so, there must be no delay; the difficulty of attack increased, the power of the assailants diminished with every year by which the peace was prolonged.
Five years had scarce elapsed since the contest ended, and all the wounds must still have been bleeding which the twenty-two years' war had inflicted on the peasantry of Samnium, when in the year 456 the Samnite confederacy renewed the struggle. The last war had been decided in favour of Rome mainly through the alliance of Lucania with the Romans and the consequent standing aloof of Tarentum.
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Reference address : https://www.ellopos.net/elpenor/rome/2-06-italians-rome.asp?pg=31