The army then halted, to receive the parting injunctions of the Caliph. ‘See,’ said he, addressing Osâma, ‘that thou avoid treachery and deceit. Depart not in any wise from the right. Thou shalt mutilate none; neither shalt thou kill child or aged man, nor any woman. Injure not the date-palm, neither burn it with fire; and cut not down any tree wherein is food for man or beast. Slay not of the flocks or herds or camels, saving for needful sustenance. Ye may eat of the meat which the men of the land shall bring unto you in their vessels, making mention thereon of the name of the Lord. And the monks with shaven heads that spend their lives in monasteries, if they submit, leave them in their cloisters unmolested. Now march forward in the name of the Lord, and may He protect you from sword and pestilence!’ [Sidenote: Osâma returns victorious, July and August.] So Abu Bekr returned with Omar to Medîna. Osâma marched by Wâdi al Cora, in the direction of Dûma, Obna, and the highlands south of Syria. The brunt of his attack fell upon the Beni Codhâa, and the semi-Christian tribes which, under the Roman banner, had discomfited and slain his father. That disaster was now avenged in fire and blood. The land was ravaged far and near, and after an absence of two months, the army returned laden with spoil.[14] Meanwhile stirring events had transpired at Medîna, of which an account is given in the chapter following. CHAPTER III. MEDINA THREATENED. A.H. XI. JUNE AND JULY, A.H. 632. [Sidenote: Beneficial effects of Osâma’s expedition.] In after days Abu Bekr used to look back with a just pride and satisfaction to his despatch, against a universal reclamation, of Osâma’s force. Public opinion was not long in justifying the act and attributing thereto results of essential benefit. The firmness of his attitude inspired the Bedouin tribes with a sense of stability in the government. If the leaders at Medîna had not been confident in their strength at home they would not have sent away this army; and the Arabs, reasoning thus, were restrained from much that they might otherwise have attempted. Still the position was critical, and at times sufficiently alarming. [Sidenote: Courageous attitude of Abu Bekr.] It was indeed a thing of which the brave old Caliph might proud. ‘The Arabs,’ so the tradition runs, ‘were on all sides rising in rebellion. Apostasy and disaffection began to raise their heads; Christians and Jews to stretch out their necks; and the Faithful were left like a flock of sheep without a shepherd--their Prophet gone, their numbers few, and their foes a multitude.’ It was in face of all this that Abu Bekr sent off beyond recall his only force, and left Medîna open and, to the outward eye, defenceless. [Sidenote: Insurrection throughout Arabia.]