Bahrein reduced--Reduction of Omân and Mâhra--Rebellion in Yemen--Reduction of Yemen--Reduction of Hadhramaut--Authority re-established in the South 47 CHAPTER IX. ENROLMENT OF THE BEDOUIN TRIBES FOR WAR BEYOND ARABIA. Arabia aroused by the war-cry from without--All slaves of Arab blood set free--Death of Fâtima 60 CHAPTER X. CAMPAIGN OF KHALID IN IRAC. A.H. XII. A.D. 633. State of Persia--Mesopotamia and the Syrian Desert--Irâc Araby described--Khâlid’s victories over the Persians--The River of Blood--Hîra capitulates--Hîra remains Christian--Khâlid’s administration in Irâc--Khâlid takes Anbâr and Ain Tamar--Dûma stormed by Khâlid--Expeditions against Bedouins in Irâc--Khâlid’s pilgrimage incognito to Mecca 66 CHAPTER XI. CAMPAIGN IN SYRIA--BATTLE OF WACUSA ON THE YERMUK. A.H. XIII. A.D. 634. Defeat of Khâlid ibn Saîd in Syria--Reinforcements sent to Syria--Roman army opposes the Moslems on the Yermûk--Indecisive skirmishing with Romans--Khâlid transferred to Syria--Khâlid’s journey across the Desert--Roman and Moslem armies compared--Khâlid takes command--Great battle of Wacûsa on the Yermûk--Roman army totally defeated 92 CHAPTER XII. EVENTS IN IRAC--MOTHANNA AND THE PERSIANS--NEED OF REINFORCEMENTS. Moharram--Jumâd, A.H. XIII. March--August, A.D. 634. Mothanna asks Abu Bekr for reinforcements 112 CHAPTER XIII. SICKNESS AND DEATH OF ABU BEKR. Jumâd II., A.H. XIII. August, A.D. 634. Abu Bekr visits Mecca on pilgrimage--Abu Bekr appoints Omar his successor--Death and burial of Abu Bekr--Character of Abu Bekr 115 CHAPTER XIV. ACCESSION OF OMAR--REINFORCEMENTS FOR IRAC--CAMPAIGN THERE UNDER ABU OBEID AND MOTHANNA. Jumâd II., A.H. XIII.--Moharram, A.H. XIV. August, A.D. 634–March, A.D. 635. Omar raises a new levy for Irâc--Rustem sends a Persian army against Abu Obeid--Battle of the Bridge--Moslems routed--Fresh levies ordered to Irâc--Mothanna’s victory at Boweib--Character of Mothanna 125 CHAPTER XV. CAMPAIGN IN SYRIA--TAKING OF DAMASCUS--BATTLE OF FIHL. A.H. XIV. A.D. 635.