In 1030, Xingliao and its Jurchen and Goryeo allies were defeated by a Liao pincer attack led by Punu. One of Da Yanlin's officers, Yang Xiangshi, betrayed him and opened the Eastern Capital's gates to the Khitans.
In 1030, Xingliao and its Jurchen and Goryeo allies were outmaneuvered by a Liao pincer attack led by Punu. One of Da Yanlin's officers, Yang Xiangshi, turned against him and opened the Eastern Capital's gates to the Khitans.