(M663) Soon after his elevation, the Carthaginians advanced, under Imoleo, to attack Gela, which was relieved by Dionysius with a force of fifty thousand men. Intrenching himself between Gela and the sea, opposite the Carthaginians, he resolved to attack the invaders, but was defeated and obliged to retreat, so that Gela fell into the hands of the Carthaginians, who perpetrated their usual cruelties. This defeat occasioned a mutiny at Syracuse, and his house was plundered of the silver and gold and valuables which he had already collected. But he rapidly returned to Syracuse, and punished the mutineers, and became master of the city, driving away the rich citizens who had vainly obstructed his elevation. He abolished every remnant of freedom, and ruled despotically with the aid of his mercenaries, and the common people who rallied to his standard. (M664) It was fortunate for him that the Carthaginians, although victors at Gela, made proposals of peace, which were accepted. Dionysius accepted a peace, the terms of which were favorable to Carthage, in order to secure his own power. He betrayed the interests of Sicily to an enemy from selfish and unworthy motives. The whole south of Sicily was consigned to the Carthaginians, and Syracuse to Dionysius. (M665) Dionysius now concentrated all his efforts to centralize and maintain his power. He greatly strengthened the fortifications of Syracuse. He constructed a new wall, with lofty towers and elaborate defenses, outside the mole which connected the islet Ortygia with Sicily. He also erected a citadel. He then had an impregnable stronghold, powerful for attack and defense. The fortress he erected in the islet of Ortygia he filled with his devoted adherents, consisting mostly of foreigners, to whom he assigned a permanent support and residence. He distributed anew the Syracusan territory, reserving the best lands for his friends, who thus became citizens. By this wholesale confiscation he was enabled to support ten thousand mercenary troops, devoted to him and his tyranny. The contributions he extorted were enormous, so that in five years twenty per cent of the whole property of Syracuse was paid into his hands.