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
It is conceivable that in a great community with extensive dominion like the Roman the royal power, particularly if it had been in the same family for several generations, would be more capable of resistance, and the struggle would thus be keener, than in the smaller states; but there is no certain indication of any interference by foreign states in the struggle.
The great war with Etruria--which possibly, moreover, has been placed so close upon the expulsion of the Tarquins only in consequence of chronological confusion in the Roman annals--cannot be regarded as an intervention of Etruria in favour of a countryman who had been injured in Rome, for the very sufficient reason that the Etruscans notwithstanding their complete victory neither restored the Roman monarchy, nor even brought back the Tarquinian family.
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Reference address : https://www.ellopos.net/elpenor/rome/2-01-constitution-magistrate.asp?pg=6