"When several years had elapsed, he received information about the territories of Turkistan and Tibet, to the east of Lakhnauti, and he began to entertain a desire of taking Tibet and Turkistan. For this purpose he prepared an army of about ten thousand horse. Among the hills which lie between Tibet and the territory of Lakhnauti, there are three races of people. The one is called Kuch (Kuch Behar), the second Mich, and the third, Tiharu. They all have Turki features and speak different languages, something between the language of Hind and that of Tibet. One of the chiefs of the tribes of Kuch and Mich, who was called Ali Mich, had been converted to Muhammadanism by Muhammad Bakhtiyar, and this man agreed to conduct him into the hills. He led him to a place where there was a city called Mardhan-kot. It is said that in the ancient times when Gurshasp Shah returned from China, he came to Kamrud (Kam-rup) and built this city. Before the town there runs a stream which is exceedingly large. It is called Bangamati [Brahmaputra]. When it enters the country of Hindustan it receives in the Hindi language the name of Samundar. In length, breadth, and depth, it is three times greater than the Ganges. Muhammad Bakh-tiyar came to the banks of this river, and Ali Mich went before the Muhammadan army. For ten days they marched on until he led them along the upper course of the river into the hills, to a place where from old times a bridge had stood over the water having about twenty (bist o and) arches of stone. When the army reached the bridge, Bakhtiyar posted there two officers, one a Turk, and the other a Khilji, with a large force to secure the place till his return. With the remainder of the army he then went over the bridge. The Rai of Kamrup, on receiving intelligence of the passage of the Muhammadans, sent some confidential officers to warn Bakhtiyar against invading the country of Tibet, and to assure him that he had better return and make more suitable preparations. He also added that he, the Rai of Kamrup, had determined that next year he also would muster his forces and precede the Muhammadan army to secure the country. Muhammad Bakhtiyar paid no heed to these representations, but marched on towards the hills of Tibet."