The Ephthalite monarch, on learning the intention of Perozes, prepared to meet his attack by stratagem. He had taken up his position in the plain near Balkh, and had there established his camp, resolved to await the coming of the enemy. During the interval he proceeded to dig a deep and broad trench in front of his whole position, leaving only a space of some twenty or thirty yards, midway in the work, untouched. Having excavated the trench, he caused it to be filled with water, and covered carefully with boughs of trees, reeds, and earth, so as to be undistinguishable from the general surface of the plain on which he was encamped. On the arrival of the Persians in his front, he first of all held a parley with Perozes, in which, after reproaching him with his ingratitude and breach of faith, he concluded by offering to renew the peace. Perozes scornfully refused; whereupon the Ephthalite prince hung on the point of a lance the broken treaty, and, parading it in front of the Persian troops, exhorted them to avoid the vengeance which was sure to fall on the perjured by deserting their doomed monarch. Upon this, half the army, we are told, retired; and Khush-newaz proceeded to effect the destruction of the remainder by means of the plan which he had so carefully prepared beforehand. He sent a portion of his troops across the ditch, with orders to challenge the Persians to an engagement, and, when the fight began, to fly hastily, and, returning within the ditch by the sound passage, unite themselves with the main army. The entire Persian host, as he expected, pursued the fugitives, and coming unawares upon the concealed trench plunged into it, was inextricably entangled, and easily destroyed. Perozes himself, several of his sons, and most of his army perished. Mruz-docht, his daughter, the chief Mobed, and great numbers of the rank and file were made prisoners. A vast booty was taken. Khush-newaz did not tarnish the glory of his victory by any cruelties; he treated the captives tenderly, and caused search to be made for the body of Perozes, which was found and honorably interred.