A delegation from the Three Right Wing Tumens (Ordos, Tümed and Yöngshiyebü) invited Dayan Khan to rule them. Because Iburai Taishi (also known as Ibrahim), an Uighur adventurer or an Oirat/Kharchin warlord and Mandulai dominated the area, the three Tumens were seeking a more agreeable arrangement. In a skirmish raid on one of the rebel groups, the imperial army killed Ibrahim’s younger brother. Dayan Khan dispatched to the Tumens his sons Ulusbaikh (Ulusbold) and Barsubolad Sainalag. As Ulusbold was being enthroned as jinong, he was killed in a riot and Barsubolad escaped. In revenge, Dayan Khan attacked the Three Right Wing Tumens with his three Left Wing Tumens (Chakhar, Khalkha and Uriankhai), the Khorchin and the Abagha. Because a large group of the Uriankhai Tumen defected to Iburai, Dayan Khan was first defeated at Turgen Stream at present-day Tumed territory.