in the island—­Selinus, Himera, Agrigentum, Gela, and Messana—­were utterly destroyed by the Carthaginians in the course of these unhappy conflicts:  and Dionysius was not displeased to see Hellenism destroyed or suppressed there, so that, leaning for support on foreign mercenaries enlisted from Italy, Gaul and Spain, he might rule in greater security over provinces which lay desolate or which were occupied by military colonies.  The peace, which was concluded after the victory of the Carthaginian general Mago at Kronion (371), and which subjected to the Carthaginians the Greek cities of Thermae (the ancient Himera), Segesta, Heraclea Minoa, Selinus, and a part of the territory of Agrigentum as far as the Halycus, was regarded by the two powers contending for the possession of the island as only a temporary accommodation; on both sides the rivals were ever renewing their attempts to dispossess each other.  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.  After the failure of that attempt, the Carthaginian fleet commanded without a rival the whole western Mediterranean; and their endeavours to occupy Syracuse, Rhegium, and Tarentum, showed the extent of their power and the objects at which they aimed.  Hand in hand with these attempts went the endeavour to monopolize more and more the maritime commerce of this region, at the expense alike of foreigners and of their own subjects; and it was not the wont of the Carthaginians to recoil from any violence that might help forward their purpose.  A contemporary of the Punic wars, Eratosthenes, the father of geography (479-560), affirms that every foreign mariner sailing towards Sardinia or towards the Straits of Gades, who fell into the hands of the Carthaginians, was thrown by them into the sea; and with this statement the fact completely accords, that Carthage by the treaty of 406 (6) declared the Spanish, Sardinian, and Libyan ports open to Roman trading vessels, whereas by that of 448,(7) it totally closed them, with the exception of the port of Carthage itself, against the same.