Mohe-Goguryeo victory The Battle of Tianmenling (Chinese: 天門嶺之戰), or the Battle of Cheonmun-ryeong in Korean (Korean: 천문령 전투), was fought between Dae Jo-yeong, later founder of Balhae, and Li Kaigu (李楷固), a Khitan commander of the Chinese Tang dynasty and Wu Zhou dynasty.
In spite of Empress Wu Zetian's appeasement policy, they fled eastward to the former land of Goguryeo.
The Zhou sent general Li Kaigu to give chase, and subsequently Geolsa Biu and Dae Jung-sang were killed.
Dae Jo-yeong integrated the Goguryeo people under the two leaders and resisted the Tang's attack.
Dae jo yeong claimed himself the King of Jin in 699 and put his capital at Dongmo Mountain, in the south of today's Jilin province.