Startled by the strange summons, Hormuz informed the king, and set out to meet the invader with an army, the wings of which were commanded by princes of the royal house. He marched in haste, thinking to have an easy victory over the untrained tribes of the desert; and reaching first the encamping ground, took possession of the springs. Khâlid, coming up, bade his force alight, and at once unload their burdens. [Sidenote: Moharram, A.H. XII. March, A.D. 633.] ‘Then,’ said he, ‘let us fight for the water forthwith; by my life! the springs shall be for the braver of the two.’ Thereupon Hormuz challenged Khâlid to single combat, and, though he treacherously posted an ambuscade, was in the encounter slain. The Moslems then rushed forward, and with great slaughter put the enemy to flight, and pursued them to the banks of the Euphrates. The Arabs had now a foretaste of the spoils of Persia. The share of each horseman was one thousand dirhems, besides great store of arms.[107] The jewelled tiara of Hormuz, symbol of his rank, and valued at a hundred thousand pieces, was sent to the Caliph with the royal Fifth.[108] An elephant taken in the field was marched as part of the prize to Medîna; but having been paraded about the town, much to the wonder of the admiring citizens, was sent back as unsuitable to the place.[109] The action was called ‘the Battle of the Chains,’ for we are told that a portion of the Persian army was bound together to prevent its giving way.[110] [Sidenote: ‘The Lady’s Castle.’] The defeated army fled towards the capital, and Mothanna with his horse hastened after them. Crossing the Euphrates, he came upon a fortress called ‘The Lady’s Castle,’ held by a Persian princess. Leaving his brother Moänna to besiege her, he advanced to a second fort defended by the husband. This he took by storm, and put the garrison to the sword; which, when the lady heard of, she embraced Islam, and, forgetting her Persian lord, readily gave her hand to Mothanna’s brother. [Sidenote: Persians again defeated at Madzâr.]