Bāber, on hearing of the death of Shaybānī Khān, and having been led to suppose that his presence would be attended by most important advantages, again set out from Kābul, and, entering Transoxiana, entirely defeated the Uzbeg army sent out to meet him under Hamza Sultan, A.H. 917 (1511). The Uzbegs were pursued as far as the Iron Gates. Meanwhile Bāber’s victorious army assembled in Hisār, where it was now reinforced by a larger body of Persians, sent by Shāh Isma`īl, who made common cause with Bāber against the Uzbegs. The united forces, numbering 60,000 men, next marched against Karshī, where Sultan `Ubaydullah had fortified himself, while the most of the Uzbeg Sultans had fled to Samarkand. On the march, Bāber learnt that `Ubaydullah had abandoned Karshī and fled to Bokhārā. Bāber at once followed him, marching day and night until he reached the city, whence he drove `Ubaydullah into the deserts of Turkestān.[436] When the rest of the Uzbeg Sultans in Samarkand learnt this disaster, they were filled with terror and fled in disorder into different parts of Turkestān, leaving Bāber absolute master of Transoxiana. He now entered Samarkand amid the rejoicings of the people, who welcomed him as the rightful successor to the realms of Tīmūr. But the enthusiasm of the orthodox Sunnis began to cool when they found that Bāber still maintained cordial relations with the Shi`ite Shāh Isma`īl and carried out the stipulation on which the alliance was based by recognising his suzerainty. Becoming aware of the popular discontent, the Uzbeg Sultans collected their forces and marched out of Turkestān.[437] Their main body took the direction of Tashkent, while `Ubaydullah, with the remainder, proceeded to Bokhārā by way of Yati Kudūk.[438] Bāber also advanced on Bokhārā at the head of 40,000 well-equipped men, and overtook `Ubaydullah at Kūl-Melik.[439] The Uzbeg had only 3000 men under his command; but, nothing daunted by the fearful odds, he rallied his troops and attacked Bāber’s force with such fury that, after a bloody encounter, he put them utterly to rout, A.H. 918 (1512). After this disaster Bāber returned to Samarkand, but, finding no supporters there, fled to Hisār, after a reign of just eight months.[440] Though the Uzbegs were again masters of Transoxiana, their position was by no means secure. On the west, Bāber, with the aid of 60,000 Persians, sent at his request by Shāh Isma`īl, under Amīr Yār Ahmed Isfahānī, known as Najm-i-Sāni, or the Second Star, passed the Iron Gates and, entering Karshī, massacred the inhabitants and sacked the town. On the east, the Khān of Moghūlistan, on learning Bāber’s success at Karshī, marched out by way of Andijān to attack Suyunjik Khān, one of the chief Uzbeg Sultans. An encounter took place at Bishkand,[441] in which the Khān was utterly defeated.