[1][2] According to Saghang Sechen, Delbeg was a son of Öljei Temür Khan (Buyanshir) who had instructed the Oriat leader Bahamu to make Delbeg the new Khan.
[3] However records in Shajrat Ul Atrak and Habib al-siyar, Delbeg was a direct descendant of Ariq Böke, and this blood lineage able to rally some support from Mongol populace in west.
The Oirats forced Arughtai to seek refuge in the lands bordering the Ming dynasty in 1414.
In 1415, the Western Mongols led by Bahamu, Delbeg and Bolad were defeated by the Ming army which penetrated as far as Tuul River.
[4] The Ming Emperor was persuaded to return by his followers while the Mongols retired northwards.