The Battle of Gwiju, which occurred in 1019, was the major battle during the Third Goryeo–Khitan War (1018-1019), fought between the Khitan-led Liao dynasty of China and the Goryeo dynasty of Korea.
After crossing the Aprok River, the Liao dynasty troops invaded the Goryeo dynasty. The Goryeo general Kang Kamch'an dammed a stream and released it as the Liao troops were crossing. Despite suffering significant casualties, some Liao troops marched to Gaegyeong, the capital of Goryeo.
During their campaign, general Kang Kamch'an cut the supplies of the Liao troops and harassed them relentlessly. Exhausted, the Liao troops decided to retreat hastily northward. Monitoring the movement of their troops, general Kang Kamch'an attacked them in the vicinity of Gwiju, ending in a complete victory for the Goryeo dynasty.
Aftermath
After the battle, peace negotiations followed and the Liao dynasty did not invade Korea again. Korea entered in a long and peaceful period with its foreign neighbours across the Yalu River.