侯君集
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. The son of Qu Wentai, the king of Karakhoja, surrendered and the former kingdom was annexed.