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
Four several times--in 360 in the
time of Dionysius the elder; in 410 in that of Timoleon; in 445 in
that of Agathocles; in 476 in that of Pyrrhus--the Carthaginians were
masters of all Sicily excepting Syracuse, and were baffled by its
solid walls; almost as often the Syracusans, under able leaders, such
as were the elder Dionysius, Agathocles, and Pyrrhus, seemed equally
on the eve of dislodging the Africans from the island. But more and
more the balance inclined to the side of the Carthaginians, who were,
as a rule, the aggressors, and who, although they did not follow out
their object with Roman steadfastness, yet conducted their attack with
far greater method and energy than the Greek city, rent and worn out
by factions, conducted its defence.
The Phoenicians might with reason
expect that a pestilence or a foreign -condottiere- would not always
snatch the prey from their hands; and for the time being, at least at
sea, the struggle was already decided:(5) the attempt of Pyrrhus to
re-establish the Syracusan fleet was the last.