Battle of Gilju (1109) — the same event in Goryeosa and Goryeosa Jeolyo

Goryeosa: The Jurchen besiege Gilju; Oh Yeon-chong rescues it, but the army is badly defeated.; Goryeosa Jeolyo: The Jurchen besiege Gilju fortress…

What each source says

Goryeosa (History of Goryeo) · AD 1109 · 길주

The Jurchen besiege Gilju; Oh Yeon-chong rescues it, but the army is badly defeated.

庚申，女眞圍吉州，吳延寵引兵救之，師大敗。
Location: 世家卷13 睿宗四年

Goryeosa Jeolyo (Essentials of Goryeo History) · AD 1109

The Jurchen besiege Gilju fortress and attack from six stockades; Yi Gwan-jin holds out by building a double wall in a single night, while Oh Yeon-chong, going to relieve it, is badly defeated in an ambush

○女眞圍吉州城，去城十里築小城，立六柵，累月攻城甚急，城幾陷。
Location: 권7 睿宗文孝大王四年

Place: 길주

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