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Conquest of Karakhoja
	Part of Tang campaign against the oasis states
	; Map of the campaigns against the oasis states of the Tarim Basin, including the defeat of Karakhoja
Date	640 CE
Location	Tarim Basin
Result	Decisive Tang victory Annexation of Karakhoja as a Tang prefecture;
Belligerents
Tang dynasty	Karakhoja; Western Turkic Khaganate
Commanders and leaders
Hou Junji; Xue Wanjun; Qibi Heli	Qu Wentai ; Qu Zhisheng (POW); Qu Zhizhan (POW)

The Tang campaign against Karakhoja, known as Gaochang in Chinese sources, was a military campaign in 640 CE conducted by Emperor Taizong of the Tang dynasty against the Tarim Basin kingdom of Karakhoja, based in the city of Turfan in Xinjiang. The Western Turks provided their ally Karakhoja with soldiers, but the army retreated when the Tang forces arrived. Karakhoja surrendered and the kingdom was incorporated as a Tang prefecture.

Background

Sporadically controlled by previous Chinese dynasties, Karakhoja was home to a large Chinese population.^[1] The kingdom was heavily influenced by Chinese culture and was the closest of the Tarim Basin oasis states to Tang China. Karakhoja had been ruled since 498 by the Qu royal family, who governed the state as the most sinicized of the Tarim Basin kingdoms.^[2] During the reign of the Qu, Chinese was the official written language of Karakhoja, students were taught with the Chinese classics, and the government bureaucracy was based on the political structure of imperial China.^[1]

Campaign

The Tu-lu Qaghan, who had risen to power in 638, offered Karakhoja the military protection of the Western Turkic Khaganate. With the support of the Western Turks, Karakhoja halted the Silk Road trade route that connected Tang China with Central Asia. In response, Emperor Taizong dispatched a military campaign led by general Hou Junji. The army reached Karakhoja in 640 and defeated the oasis state. The Western Turk forces sent to defend Karakhoja fled as the Tang soldiers approached.^[3] The son of Qu Wentai, the king of Karakhoja, surrendered and the former kingdom was annexed.^[1]

Aftermath

Following the annexation of Karakhoja, the oasis state was placed under direct Tang administration and structured as a prefecture. Karakhoja was overseen as part of the Anxi Protectorate, or Protectorate General to Pacify the West, established to govern the Western Regions of Xinjiang.^[1] Soon after the conquest, a population census was conducted to implement the equal-field system mandatory for Chinese prefectures.^[4] In 640, the year of Karakhoja's annexation, it was reported that there were 8,000 households and 37,700 inhabitants living in Turfan.^[5]

The fall of Karakhoja raised the suspicions of the nearby kingdom of Karasahr.^[6] Threatened by Chinese troops stationed in the region, Karasahr sided with the Western Turks.^[7] The Tang responded by invading and annexing Karasahr in 644.^[6]

Citations

^ ^a ^b ^c ^d Hansen 2012, p. 91.
^ Wechsler 1979, p. 224-225.
^ Wechsler 1979, p. 225.
^ Hansen 2012, pp. 91–92.
^ Hansen 2012, p. 92.
^ ^a ^b Grousset 1970, p. 99.
^ Wechsler 1979, p. 226.

Bibliography

Grousset, René (1970). The Empire of the Steppes: A History of Central Asia. Rutgers University Press. ISBN 978-0-8135-1304-1.
Hansen, Valerie (2012). The Silk Road: A New History. Oxford University Press. ISBN 978-0-19-515931-8.
Wechsler, Howard J. (1979). "T'ai-tsung (reign 626–49) the consolidator". In Twitchett, Dennis (ed.). The Cambridge History of China, Volume 3: Sui and T'ang China, 589–906, Part I. Cambridge: Cambridge University Press. pp. 188–241. ISBN 978-0-521-21446-9.