The tide of infidel invasion had reached its limits. The strong right arm of Charles dealt such ponderous blows that the Moslems broke in confusion, and this savior of Christendom was thenceforth known as Charles Martel: "Karl of the Hammer." After this crushing disaster at Tours the Moors realized that they were not invincible. Their vaulting ambition did not again try to overleap the Pyrenees; and they addressed themselves to settling affairs in their new territory. It has been wisely said that if the Mahommedan state had been confined within the borders of Arabia, it would speedily have collapsed. Islam became a world-wide religion when it clothed itself with armor, and became a church militant. It was _conquest_ which saved the faith of the Prophet. In its home in Asia the Empire of Mahommed was composed of hostile tribes and clans, and as it moved westward it gathered up Syrians, Egyptians, and the Berbers on the African coast, who, when Morocco was reached, were known as Moors. This strange, heterogeneous mass of humanity, all nourished from Arabia, was held together by two things: the _Koran_ and the _sword_. When conquest was exchanged for peaceful possession, all the internecine jealousies, the tribal feuds, and old hatreds burst forth, and the first fifty years of Moorish rule in Spain was a period of internal strife and disorder--Arabs and Moors were jealously trying to undermine each other; while the Arabs themselves were torn by factions representing rival clans in Damascus. But a singular clemency was shown toward the conquered Spaniards. They were permitted to retain their own law and judges, and their own governors administered the affairs of the districts and collected the taxes. The rule of the conquering race bore upon the people actually less heavily than had the old Gothic rule. Jews and Christians alike were free to worship whom or what they pleased; but, at the same time, great benefits were bestowed upon those who would accept the religion of the Prophet. The slave class, which was very large and had suffered terrible cruelties under its old masters, was treated with especial mildness and humanity. There was a simple road to freedom opened to every man. He had only to say, "There is one God, and Mahommed is his Prophet," and on the instant he became a freeman! Such gentle proselytizing as this speedily won converts, not alone among slaves but from all classes. The pacification of Spain by the Romans had required centuries; while only a few years sufficed to make of the vanquished in the southern provinces, a contented and almost happy people; not only reconciled, but even glad of the change of masters. Never was Andalusia so mildly, justly, and wisely governed as by her Arab conquerors.