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
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.
