Conquest of the Western Turks

Conquest of the Western Turks
Part of the Tang campaigns against the Western Turks
Tang's campaigns against Western Turks
Date 655–657 Location Central Asia Result Decisive Tang victory Ashina Helu defeated and captured Dissolution of the Western Turkic Khaganate Strengthened Tang rule of Xinjiang Regions controlled by the Western Turks under Tang suzerainty
Belligerents
Tang dynasty Former vassals of the Western Turks (Uighurs[1][2])	Western Turkic Khaganate
Commanders and leaders
Su Dingfang Cheng Zhijie Ashina Mishe Ashina Buzhen Xiao Siye Ren Yaxiang	Ashina Helu
Strength
10,000+ Tang and Uyghur infantry and cavalry	100,000 infantry and cavalry

The conquest of the Western Turks, known as the Western Tujue in Chinese sources, was a military campaign in 655–657 led by the Tang dynasty generals Su Dingfang and Cheng Zhijie against the Western Turkic Khaganate ruled by Ashina Helu. The Tang campaigns against the Western Turks began in 640 with the annexation of the Tarim Basin oasis state Gaochang, an ally of the Western Turks. Several of the oasis states had once been vassals of the Tang dynasty, but switched their allegiance to the Western Turks when they grew suspicious of the military ambitions of the Tang. Tang expansion into Central Asia continued with the conquest of Karasahr in 644 and Kucha in 648. Cheng Zhijie commanded the first foray against the West Tujue, and in 657 Su Dingfang commanded the main army dispatched against the Western Turks, while the Turkic generals Ashina Mishe and Ashina Buzhen led the side divisions. The Tang troops were reinforced by cavalry supplied by the Uyghurs, a tribe that had been allied with the Tang since their support for the Uyghur revolt against the Xueyantuo. Su Dingfang's army defeated Helu at the battle of Irtysh River.

The victory strengthened Tang control of the Western Regions, now modern Xinjiang, and brought the regions formerly ruled by the Khaganate into the Tang empire. Puppet qaghans, the Turkic title for ruler, and military garrisons were installed to administer the newly acquired territories. The Tang dynasty achieved its maximum territorial extent as its western borders reached the eastern frontier of the Umayyad Caliphate. Later on, Turkic revolts ended Tang hegemony beyond the Pamir Mountains in modern Tajikistan and Afghanistan, but a Tang military presence remained in Dzungaria and the Tarim Basin. Central Asia absorbed cultural influences from the conflict. Turkic culture and language spread into Central Asia, as did artistic and political influences from the Tang dynasty. Many of the Tang generals and soldiers stationed in the region were ethnically Turkic, and the prevalence of Indo-European languages in Central Asia declined with acceleration of Turkic migration. The Turks, Tibetans, and the Tang competed for control over Central Asia for the next few centuries.