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
Extension of Rome and Latium to the East and South
The permanently united nation was able not only to maintain, but also to extend on all sides its power. We have already(9) mentioned that the Etruscans remained only for a short time in possession of supremacy over Latium, and that the relations there soon returned to the position in which they stood during the regal period; but it was not till more than a century after the expulsion of the kings from Rome that any real extension of the Roman boundaries took place in this direction.
9. Cf. II. IV. Etruscans Driven Back from Latium
With the Sabines who occupied the middle mountain range from the borders of the Umbrians down to the region between the Tiber and the Anio, and who, at the epoch when the history of Rome begins, penetrated fighting and conquering as far as Latium itself, the Romans notwithstanding their immediate neighbourhood subsequently came comparatively little into contact. The feeble sympathy of the Sabines with the desperate resistance offered by the neighbouring peoples in the east and south, is evident even from the accounts of the annals; and--what is of more importance--we find here no fortresses to keep the land in subjection, such as were so numerously established especially in the Volscian plain.
Perhaps this lack of opposition was connected with the fact that the Sabine hordes probably about this very time poured themselves over Lower Italy. Allured by the pleasantness of the settlements on the Tifernus and Volturnus, they appear to have interfered but little in the conflicts of which the region to the south of the Tiber was the arena.
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Reference address : https://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=8