Battle of Gong Mountain

In the year 927, the battle take place in northern Daegu between the forces of Goryeo under the king of Goryeo Taejo and those of Hubaekje under Gyeon Hwon.

Background
In 927, Gyeon Hwon of Hubaekje led forces into Silla's capital, Gyeongju, capturing and executing its king, King Gyeongae. Then he established King Gyeongsun as his puppet monarch before he turned his army toward Goryeo. Hearing of the news, Taejo planned a strike with 5000 cavalrymen to attack Gyeon's troops on the way back home at Gongsan near Daegu.He met Hubaekje forces and suffered disastrous defeat, losing most of his army including his generals Kim Nak and Shin Sung-gyeom, the very same man who crowned Wang as king Taejo. In this battle, Taejo himself was saved only by the heroism of his general Shin Sung-gyeom. However, it appears that the conduct of the Hubaekje forces at this time changed local sympathies to favor Taejo, who later became the king of Goryeo.