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 XLIV The Great Days of the Arabs THERE follows the most amazing story of conquest in the whole history of our race. The Byzantine army was smashed at the battle of the Yarmuk (a tributary of the Jordan) in 634 ; and the Emperor Heraclius, his energy sapped by dropsy and his resources exhausted by the Persian war, saw his new conquests in Syria, Damascus, Palmyra, Antioch, Jerusalem and the rest, fall almost without resistance to the Moslim. Large elements in the population went over to Islam. Then the Moslim turned east. The Persians had found an able general in Rustam ; they had a great host with a force of elephants ; and for three days they fought the Arabs at Kadessia (637) and broke at last in headlong rout. The conquest of all Persia followed, and the Moslem Empire pushed far into Western Turkestan and eastward until it met the Chinese. Egypt fell almost without resistance to the new con- querors, who full of a fanatical belief in the sufficiency of the Koran, wiped out the vestiges of the book-copying industry of the vVlexandria Library. The tide of conquest poured along the north coast of Africa to the Straits of Gibraltar and Spain. Spain was invaded in 710 and the Pyrenees mountains were reached in 720. In 732 the Arab advance had reached the centre of France, but here it was stopped for good at the battle of Poitiers and thrust back as far as the Pyrenees again. The conquest of Egypt had given the Moslim a fleet, and for a time it looked as though they would take Con- stantinople. They made repeated sea attacks between 672 and 718, but the great city held out against them. The Arabs had little political aptitude and no political experience, and this great Empire with its capital now at Damascus, which stretched from Spain to China, was destined to break up very speedily. From the very beginning doctrinal differences undermined its unity. But our interest here lies not with the story of its political disinte- 242