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 use of Arab auxiliaries; over Syria a number of towns and settlements of Christianized Arabs were scattered who professed a baseless loyalty to Constantinople; the Persian marches between Mesopotamia and the desert were under the control of an Arab tributary prince, whose capital was at Hira. Arab influence was strong in such cities as Damascus, where Christian Arab gentlemen would read and recite the latest poetry from the desert competitors. There was thus a great amount of easily assimilable material ready at hand for Islam.

And the military campaigns that now began were among the most brilliant in the world's history. Arabia had suddenly become a garden of fine men. The name of Khalid stands out as the brightest star in a constellation of able and devoted Moslem generals. Whenever he commanded he was victorious, and when the jealousy of the second Caliph, Omar, degraded him unjustly and inexcusably, he made no ado, but served Allah cheerfully and well as a subordinate to those over whom he had ruled. We cannot trace the story of this warfare here; the Arab armies struck simultaneously at Byzantine Syria and the Persian frontier city of Hira, and everywhere they offered a choice of three alternatives: either pay tribute, or confess the true God and join us, or die. They encountered armies, large and disciplined but spiritless armies, and defeated them. And nowhere was there such a thing as a popular resistance. The people of the populous irrigation lands of Mesopotamia cared not a jot whether they paid taxes to Byzantium or Persepolis or to Medina; and of the two, Arabs or Persian court, the Arabs, the Arabs of the great years, were manifestly the cleaner people, more just and more merciful. The Christian Arabs joined the invaders very readily and so did many Jews. Just as in the west, so now in the east, an invasion became a social revolution. But here it was also a religious revolution with a new and distinctive mental vitality.

It was Khalid who fought the decisive battle (634) with the army of Heraclius upon the banks of the Yarmuk, a tributary