We are told that the war of Varahran V. with this people commenced with an invasion of his kingdom by their Khacan, or Kahn, who crossed the Oxus with an army of 35,000 (or, according to others, of 250,000) men, and carried fire and sword into some of the most fertile provinces of Persia. The rich oasis, known as Meru or Merv, the ancient Margiana, is especially mentioned as overrun by his troops, which are said by some to have crossed the Elburz range into Khorassan and to have proceeded westward as far as Kei, or Rhages. When news of the invasion reached the Persian court, the alarm felt was great; Varahran was pressed to assemble his forces at once and encounter the unknown enemy; he, however, professed complete indifference, said that the Almighty would preserve the empire, and that, for his own part, he was going to hunt in Azerbijan, or Media Atropatene. During his absence the government could be conducted by Narses, his brother. All Persia was now thrown into consternation; Varahran was believed to have lost his senses; and it was thought that the only prudent course was to despatch an embassy to the Khacan, and make an arrangement with him by which Persia should acknowledge his suzerainty and consent to pay him a tribute. Ambassadors accordingly were sent; and the invaders, satisfied with the offer of submission, remained in the position which they had taken up, waiting for the tribute, and keeping slack guard, since they considered that they had nothing to fear. Varahran, however, was all the while preparing to fall upon them unawares. He had started for Azerbijan with a small body of picked warriors; he had drawn some further strength from Armenia; he proceeded along the mountain line through Taberistan, Hyrcania, and Nissa (Nishapur), marching only by night, and carefully masking his movements. In this way he reached the neighborhood of Merv unobserved. He then planned and executed a night attack on the invading army which was completely successful. Attacking his adversaries suddenly and in the dark--alarming them, moreover, with strange noises, and at the same time assaulting them with the utmost vigor--he put to flight the entire Tatar army. The Khan himself was killed; and the flying host was pursued to the banks of the Oxus. The whole of the camp equipage fell into the hands of the victors; and Khatoun, the wife of the great Khan, was taken. The plunder was of enormous value, and comprised the royal crown with its rich setting of pearls. After this success, Varahran, to complete his victory, sent one of his generals across the Oxus at the head of a large force, and falling upon the Tatars in their own country defeated them a second time with great slaughter. The enemy then prayed for peace, which was granted them by the victorious Varahran, who at the same time erected a column to mark the boundary of his empire in this quarter, and, appointing his brother Narses governor of Khorassan, ordered him to fix his residence at Balkh, and to prevent the Tatars from making incursions across the Oxus. It appears that these precautions were successful, for we hear nothing of any further hostilities in this quarter during the remainder of Varahran's reign.