The Tang campaign against Karakhoja, known as Gaochang in Chinese sources, is a military campaign in 640 CE conducted by the Tang Dynasty emperor Taizong against the Tarim Basin kingdom of Karakhoja, based in the city of Turfan in Xinjiang.
The Western Turks provide their ally Karakhoja with soldiers, but the army retreats when the Tang forces arrive.
Karakhoja surrenders and the kingdom is incorporated as a Tang prefecture.
