Conquest of Kucha: The forces of Kucha surrender after a forty-day siege led by Tang dynasty general Ashina She'er, establishing Tang control over the northern Tarim Basin in Xinjiang.
The Tang campaign against Kucha was a military campaign led by the Tang dynasty general Ashina She'er against the Tarim Basin oasis state of Kucha in Xinjiang, which was aligned with the Western Turkic Khaganate. The campaign began in 648 and ended on 19 January 649, after the surrender of the Kuchan forces following a forty-day siege in Aksu. Kuchean soldiers tried to recapture the kingdom with the assistance of the Western Turkic Khaganate, but were defeated by the Tang army.