The Carthaginian government could not fail to perceive the defects of this military system, and they certainly sought to remedy them by every available means. They insisted on maintaining full chests and full magazines, that they might at any time be able to equip mercenaries. They bestowed great care on those elements which among the ancients represented the modern artillery--the construction of machines, in which we find the Carthaginians regularly superior to the Siceliots, and the use of elephants, after these had superseded in warfare the earlier war-chariots: in the casemates of Carthage there were stalls for 300 elephants. They could not venture to fortify the dependent cities, and were obliged to submit to the occupation of the towns and villages as well as of the open country by any hostile army that landed in Africa--a thorough contrast to the state of Italy, where most of the subject towns had retained their walls, and a chain of Roman fortresses commanded the whole peninsula. But on the fortification of the capital they expended all the resources of money and of art, and on several occasions nothing but the strength of its walls saved the state; whereas Rome held a political and military position so secure that it never underwent a formal siege. Lastly, the main bulwark of the state was their war-marine, on which they lavished the utmost care. In the building as well as in the management of vessels the Carthaginians excelled the Greeks; it was at Carthage that ships were first built of more than three banks of oars, and the Carthaginian war-vessels, at this period mostly quinqueremes, were ordinarily better sailors than the Greek; the rowers, all of them public slaves, who never stirred from the galleys, were excellently trained, and the captains were expert and fearless. In this respect Carthage was decidedly superior to the Romans, who, with the few ships of their Greek allies and still fewer of their own, were unable even to show themselves in the open sea against the fleet which at that time without a rival ruled the western Mediterranean.