 In the summer of 89, the forces—comprising a total of 40,000 troops—assembled at Zhuoye Mountain.Near the end of the campaign, Dou's forces chased the Northern Chanyu into the Altai Mountains, killing 13,000 Xiongnu and accepting the surrender of 200,000 Xiongnu from 81 tribes.A light cavalry of 2000 was sent towards the Xiongnu at Hami, capturing the region from them.