In May 1514, Sultan Said Khan, grandson of Yunus Khan (ruler of Moghulistan between 1462 and 1487) and the third son of Akhmad Khan, made an expedition against Kashgar from Andijan with only 5,000 tribesmen ( who represented 9 Moghul tribes- Dughlat, Duhtui, Barlas, Yarki, Ordabegi, Itarchi, Konchi, Churas and Bekchi ), and having captured the Yangihisar citadel, that defended Kashgar from south road, took the city, dethroning Mirza Abu Bakr. Soon after, other cities of Yarkand state — Yarkand, Khotan, Aksu, and Uch Turpan — joined him, and recognized Sultan Said Khan as a ruler, creating a union of six cities, called Altishahr. Sultan Said Khan's sudden success is considered to be contributed to by the dissatisfaction of the population with the tyrannical rule of Mirza Abu-Bakr and the unwillingness of the "dughlat" amirs to fight against a descendant of Chagatai Khan, and who decided, on the contrary, to bring the head of the slain ruler to Sultan Said Khan. This move put an end to almost 300 years of rule (nominal and actual) by the Dughlat emirs in the cities of West Kashgaria (1219–1514). Mirza Abu Bakr fled Yarkand for Ladakh with handful of his followers and 900 donkeys, loaded with his numerous treasuries, and being chased on his heels by Dughlat emirs and also Barlas emirs, sent by Sultan Said Khan. They almost reached him in "Karangu Tagh Mountains", but Mirza Abu Bakr managed to escape by killing all 900 donkeys and dumping all treasuries into Karakash River. During flight he found that all garrisons, that he previously deployed in Kashmir and Little Tibet ( Ladakh ), were deserted by his troops. So, he found it's impossible to stay in Ladakh, he decided to turn back and surrender to Sultan Said Khan but on half-way to Yarkand was captured and slaughtered by Dughlat emirs, who betrayed him.