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
But even the
statesman, with whom political morality was no mere phrase, might ask
in reply, how Roman burgesses, who had broken their military oath and
treacherously murdered the allies of Rome, could be placed on a level
with foreigners who had committed an outrage on foreigners, where
no one had constituted the Romans judges of the one or avengers of
the other? Had the question been only whether the Syracusans or
Mamertines should rule in Messana, Rome might certainly have
acquiesced in the rule of either.
Rome was striving for the
possession of Italy, as Carthage for that of Sicily; the designs of
the two powers scarcely then went further. But that very circumstance
formed a reason why each desired to have and retain on its frontier an
intermediate power--the Carthaginians for instance reckoning in this
way on Tarentum, the Romans on Syracuse and Messana--and why, if that
course was impossible, each preferred to see these adjacent places
given over to itself rather than to the other great power.