A great force was mustered for the enterprise from every part of Northern Africa. The wild Berbers, whose faith was weak and vacillating except when revived by the prospect of booty, assembled in vast numbers. A fleet of a hundred vessels, exclusive of the squadron of the rebels, was equipped, and sailed from Susa on the thirteenth of June, 827. Three days afterwards the army disembarked at Mazara, which city was at once surrendered by the partisans of Euphemius, who outnumbered the garrison. The imperial army soon appeared, and a bloody engagement took place, in which the great numerical superiority of the Sicilians availed nothing against the desperate valor of the invaders, well aware that there was no refuge for them in case of defeat. The shouts of the Christians mingled with the chants of the soldiers of Islam as they repeated, according to custom, the verses of the Koran; the shock of the Arab cavalry was irresistible, and, their lines once broken, the Sicilians were routed on every side and dispersed in headlong flight. The Moslem victory was complete. The booty was enormous, not the least of it being the slaves who were sent in ship-loads to Africa. Such was the distrust of their allies, that Euphemius and his followers, although constituting a body respectable in numbers, were not permitted to take part in the battle. Neither the remembrance of personal indignity and disappointed ambition, nor the thirst for vengeance cherished by the exiles, was sufficient to remove from the mind of the Moslem general the feeling of suspicion which he entertained for their professions, and the contempt with which he regarded the proverbial duplicity of the Byzantine character.