Sahara were recruited the ruthless soldiery by whom the disturbances that distracted the emirate were perpetuated. They formed an important but treacherous contingent of the armies of the khalifate. While nominally adherents of the Mohammedan faith, they continued to observe those idolatrous ceremonies which had provoked the maledictions of the Prophet. Obedience to the sovereign was always subordinated to reverence for the chieftain. They maintained under the most adverse circumstances the primitive traditions of their race. Their camp was the daily scene of savage rites, of the practice of divination, witchcraft, sorcery, and magic. In their civil organization, the patriarchal simplicity of the Desert prevailed, their military evolutions were the clamorous and irregular demonstrations of brave but undisciplined barbarians. Their overpowering impulse was that of indiscriminating destruction. They viewed with stolid indifference the incomparable monuments of Saracen culture. The most exquisite works of art, in whose fabrication was exhausted the skill of the goldsmith and the enameler, were broken and melted for the sake of the precious metals they contained. The Berber was the very embodiment of cruelty, perfidy, disorganization, and ruin. In comparison with his boundless capacity for mischief, all the destructive agencies exerted by the hostile races composing the population of the Western Khalifate were insignificant. The inexhaustible numbers of the tribes of Numidia and Mauritania, whence were drawn alike the instruments of regal tyranny and of servile revolution, their prowess, their indomitable ferocity, their impetuous ardor, the persistence of their Pagan ideas and their social customs, rendered them most formidable impediments of civilization. To the incessant immigration from Africa, to the enrolment of Berber mercenaries in the armies of Mohammedan Spain, to the impolitic appeals for aid to the semi-barbarian princes of Al-Maghreb, are to be attributed far more than to the rivalry of Arab tribes or to the inherent defects of the Moslem constitution--serious as these undoubtedly were--the succession of disasters which overtook the empire of the Ommeyades, and the unspeakable crimes which stain the Moorish annals of the eleventh century, whose deplorable consequences were felt to the remotest corners of the Peninsula.