In fact, the Asud was ever the most powerful tribe among eastern Mongolians after Yuan's withdrawal from Beijing, Asud's leader Arugtai Tayisi ever led eastern Mongolians struggled against western Mongolians Oriats and Ming Chinese for over 30 years. The Oriats finally defeated Arugtai Tayisi, the Asud lost their power and known as a sub-clan of the Kharchins later. During conflict between the Tsahar(Khan's tribe) and the west wing of the Mongols, the Asud was destroyed, some joined the Kharchins, and others were absorbed by the Ar Horchins and the Manchus.
The Alans and the Khipchaks were one of the most important royal guard of the Khans, they withdraw from Beijing to Mongolia following the Khan, and known as the asud and the Kharchin in Mongolia later.