21 ensp 0183 ensp Oirats were fully submitted to Mongol rule after their ally Jamukha Temujin s childhood friend and later rival was destroyed Subject to the khan Oirats would form themselves as a loyal and formidable faction of the Mongol war machine In 1207 Jochi the eldest son of Genghis subjugated the forest tribes including the Oirats and the Kyrgyzs