For the moment opposition was crushed both on the part of the Bedouins and the Persian troops. Khâlid would willingly have attacked Medâin, but the cautious policy of Abu Bekr withheld him. Besides the districts secured by treaty with the great landlords of the lower delta, Khâlid had now extended his rule on both sides of the Euphrates above Anbâr, and no enemy was anywhere in sight.[145] Things seeming thus to be quiet, Khâlid formed the singular resolve--the sacred month having now come round--of making the pilgrimage incognito, unknown even to his royal master. So, having recruited his army for ten days on the well-fought field of Firâdh, he gave orders to march slowly and by easy stages back to Hîra. Then, making as though he remained behind to bring up the rear-guard, he set out secretly with a small escort on his pious errand. Without a guide, he traversed the devious desert route with marvellous sagacity and speed. Having accomplished the rites of pilgrimage, he retraced his steps with like despatch, and entered Hîra just as the rear-guard from Firâdh was marching in. So well had he kept his secret, that the army thought he had been all the while at Firâdh, and had been journeying slowly back. Even Abu Bekr, who himself presided at the pilgrimage, was unaware of the presence of his great general. When, after some time, the surreptitious visit came to his knowledge, he was much displeased. But the action which he took in consequence belongs to the succeeding year.[146] CHAPTER XI. CAMPAIGN IN SYRIA.--BATTLE OF WACUSA ON THE YERMUK. A.H. XIII. A.D. 634. [Sidenote: Khâlid ibn Saîd posted on the Syrian border. A.H. XII. A.D. 633.]