The conquest Conquering of the Western Turks , known as the Western Tujue in Chinese sources , was a military campaign Military_operation in 657 led by the Tang Dynasty general Su Dingfang against the Western Turkic Khaganate ruled Control by Ashina Helu .

Su Dingfang 's army defeated Conquering Helu at the battle Hostile_encounter of Irtysh River .