In a decisive battle at Onon River, the Mongol forces of Oljei Temur were decimated by the Chinese armies of the Yongle Emperor.
Yongle Emperor's campaigns against the Mongols (1410–1424), also known as the Yongle Emperor's Northern Campaigns (simplified Chinese: 明成祖远征漠北之战; traditional Chinese: 明成祖遠征漠北之戰; lit. 'Ming Chengzu's Mobei campaigns'), was a military campaign of the Ming dynasty under the Yongle Emperor against the Northern Yuan. During his reign he launched several aggressive campaigns, defeating the Northern Yuan, Eastern Mongols, Oirats, and various other Mongol tribes.