The Battle of Altai Mountains (Chinese: 稽落山之戰), was a major expedition launched against the Xiongnu by the Han Dynasty in June, 89 AD. The battle was a success for the Han under Dou Xian (d. 92 AD). In June 89 AD, the Han dispatched a force which promptly advanced from Jilu, Manyi and Guyang in three great columns that included their allies, specifically the main army of the Southern Xiongnu. The force of General Dou Xian advanced towards the Northern Chanyu into the Altai Mountains. A large detachment then moved to the northwest, and in the major battle of the campaign they defeated the Northern Chanyu at the Altai Mountains and pursued him westwards. The Han forces killed 13,000 Xiongnu troops and accepted the surrender of 200,000 Xiongnu from 81 tribes.