Battle of Gongsan (927) — the same event in Goryeosa, Goryeosa Jeolyo and Samguk Yusa

Goryeosa: Gyeonhwon's army suddenly surrounds Taejo; Sin Sung-gyeom and Kim Rak fight fiercely and die, and Taejo barely escapes with his life…

What each source says

Goryeosa (History of Goryeo) · AD 927 · 대구

Gyeonhwon's army suddenly surrounds Taejo; Sin Sung-gyeom and Kim Rak fight fiercely and die, and Taejo barely escapes with his life.

萱兵圍王甚急，大將申崇謙、金樂力戰死之，諸軍破北，王僅以身免。
Location: 世家卷1 太祖十年

Goryeosa Jeolyo (Essentials of Goryeo History) · AD 927 · 大邱

Wang Geon meets Gyeon Hwon at Dongsu on Gongsan with 5,000 elite cavalry and fights a great battle but is at a disadvantage; Sin Sung-gyeom and Kim Rak die and the king barely escapes alive

王聞之，遣使弔祭，親率精騎五千，邀萱於公山桐藪，大戰不利。
Location: 권1 太祖神聖大王十年

Samguk Yusa (Memorabilia of the Three Kingdoms) · AD 927 · Daegu

Taejo fought Gyeon Hwon with five thousand picked troops below Gongsan and was badly beaten; Kim Rak and Sunggyeom died, and Taejo barely escaped with his life.

太祖以精騎五千。要萱於公山下大戰
Location: 紀異第二後百濟甄萱

Place: 대구

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