The Frankish Duke of Aquitaine could neither protect his duchy nor obtain a lasting treaty. In the last extremity he turned to the Mayor of the Palace, whom he had hitherto regarded as an enemy. The appeal was answered; and Charles with a great Frankish host confronted the Arabs under the walls of Poitiers. For seven days neither side would make the first move; on the eighth the infidels attacked. The Frankish host was composed of infantry protected by mail-shirts and shields; against their close-locked lines, which resembled iron walls, the Arabs dashed themselves in vain. When the attack had been repelled in disorder, the Franks advanced, bearing down resistance by sheer weight and strength. The Emir Abderrahman fell on the field, and then night put an end to the conflict. Both armies camped on the field; but next morning the Arabs had vanished in full retreat for the Pyrenees (Oct. 732). The flood of Islam had received the first check; though Spain was not to be recovered by the Franks, they were held to have saved northern Europe. Modern criticism has remarked that the internal dissensions of Moslem Spain did better service than this victory to the cause of Christendom; that the Arabs continued to hold Septimania and sent raids into Provence. But for contemporaries there was no question that the Franks had established a claim to the special gratitude of the Church, and Charles to his anomalous position as an uncrowned King. The Mayor of the Palace was fully alive to the value of ecclesiastical support. He lent his support to the work of the English missionaries Willibrord and Boniface among the unconverted German tribes (Frisians, Hessians, Thuringians) over whom he claimed supremacy. He permitted Boniface to enrol himself as the servant of the Holy See. It is true that he would not form a political alliance with the Roman Church against the Lombards. Northern wars absorbed him; wars with the Frisians, the Saxons, the rebellious Bavarians, Alemannians, and Aquitanians. But from alliance with the Church to alliance with Rome was a natural step for his successors. Shortly before his death (741) he divided his power between his sons Carlmann and Pepin, giving Austrasia to the one, Neustria to the other. But Carlmann abdicated to become a monk (747) and Pepin his junior was left to continue the work of their father single-handed. Both brothers employed Boniface to reorganise and reform the clergy of their dominions; Pepin allowed the saint to take from all the Frankish bishops an oath of subjection to the Holy See; and accepted him as Archbishop of Mainz and primate of the German church. Three years later the Mayor obtained the permission of Pope Zacharias to depose the last of the Merovingian puppet-kings and to assume the regal style; the Pope justly recommending that he should have the title to whom the power belonged (751). So ended the line of Clovis, and with it the barbarian period of Frankish history.