 In 740, the Chinese also regained control of the key fortress at Anrong, just north of Chengdu, which the Tibetans had held for over sixty years.In 742 the Chinese also managed to recapture the formidable fortress of Shipu, near the border in the Red Hills.In 747 the Chinese, under command of general Gao Xianzhi (of Goguryeo descent), fought the Tibetans and forced them to leave the region.