"Da Rgyal Mang Po Rjes (Dayan Mangbuzhi) fought a battle with Su Dingfang of the Tang at the Dongdai 東岱 (a Tibetan regional administrative unit) of Wuhai 烏海 (southwest of Lake Qinghai). Da Rgyal was killed and his army of 80,000 men was defeated by 1,000 Tang troops."