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
By these conquests the Roman territory was probably extended to about 190 square miles. Another very early achievement of the Roman arms was preserved, although in a legendary dress, in the memory of posterity with greater vividness than those obsolete struggles: Alba, the ancient sacred metropolis of Latium, was conquered and destroyed by Roman troops. How the collision arose, and how it was decided, tradition does not tell: the battle of the three Roman with the three Alban brothers born at one birth is nothing but a personification of the struggle between two powerful and closely related cantons, of which the Roman at least was triune. We know nothing at all beyond the naked fact of the subjugation and destruction of Alba by Rome.(3)
3. But there seems to be no good ground for the doubt recently expressed in a quarter deserving of respect as to the destruction of Alba having really been the act of Rome. It is true, indeed, that the account of the destruction of Alba is in its details a series of improbabilities and impossibilities; but that is true of every historical fact inwoven into legend. To the question as to the attitude of the rest of Latium towards the struggle between Rome and Alba, we are unable to give an answer; but the question itself rests on a false assumption, for it is not proved that the constitution of the Latin league absolutely prohibited a separate war between two Latin communities (Cf. I. III. The Latin League). Still less is the fact that a number of Alban families were received into the burgess-union of Rome inconsistent with the destruction of Alba by the Romans. Why may there not have been a Roman party in Alba just as there was in Capua? The circumstance, however, of Rome claiming to be in a religious and political point of view the heir-at-law of Alba may be regarded as decisive of the matter; for such a claim could not be based on the migration of individual clans to Rome, but could only be based, as it actually was, on the conquest of the town.
It is not improbable, although wholly a matter of conjecture, that, at the same period when Rome was establishing herself on the Anio and on the Alban hills, Praeneste, which appears at a later date as mistress of eight neighbouring townships, Tibur, and others of the Latin communities were similarly occupied in enlarging their territory and laying the foundations of their subsequent far from inconsiderable power.
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Reference address : https://www.ellopos.net/elpenor/rome/1-07-hegemony-rome-latium.asp?pg=3