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
As a single incident in the series of movements among the neighbouring peoples caused by this Samnite settlement may be mentioned the surprise of Cumae by Tyrrhenians from the Upper Sea, Umbrians, and Daunians in the year 230.
If we may give credit to the accounts of the matter which present certainly a considerable colouring of romance, it would appear that in this instance, as was often the case in such expeditions, the intruders and those whom they supplanted combined to form one army, the Etruscans joining with their Umbrian enemies, and these again joined by the Iapygians whom the Umbrian settlers had driven towards the south.
Nevertheless the undertaking proved a failure: on this occasion at least the Greek superiority in the art of war, and the bravery of the tyrant Aristodemus, succeeded in repelling the barbarian assault on the beautiful seaport.
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Reference address : https://www.ellopos.net/elpenor/rome/1-08-umbro-sabellian-samnites.asp?pg=8