 During Muhammad Haidar's reign in Kashgar, his brother Saniz Mirza's son Mirza Aba Bakr arrived in the town.After some time Mirza Aba Bakr left Kashgar and seized control of Yarkand; he then declared his submission to Muhammad Haidar.After taking control of Khotan as well, however, Mirza Aba Bakr turned rebellious against his uncle and proceeded to devastate the region around Kashgar and Yangi Hisar.