First Goryeo-Khitan War

First Goryeo–Khitan War
Part of Goryeo-Khitan Wars
Date November 993 - December 993 Location Northern Korean Peninsula Result Liao dynasty victory Goryeo became a Liao tributary and adopted their calendar in 994
Belligerents
Goryeo	Liao Dynasty
Commanders and leaders
Seo Hui Dae Do-su	Xiao Xunning
Strength
Unknown	Liao claimed 800,000 but the number is believed to be much lower.
Casualties and losses
Unknown	Unknown

Liao dynasty victory

The First Goryeo-Khitan War was a 10th-century conflict between the kingdom of Goryeo and the Liao dynasty (the Khitan Empire) near what is now the border between China and North Korea. It occurred in 993 and was the first of the Goryeo-Khitan Wars, which were continued with the Second Goryeo-Khitan War (1010) and Third Goryeo-Khitan War (1018).

In 993, the Khitan invaded Goryeo's northwest border with an army that the Liao commander claimed to number 800,000. They forced Goryeo to end its tributary relations with the Song dynasty, to become a Liao tributary state and to adopt Liao's calendar. With Goryeo's agreement of these requirements, the Khitan withdrew. Liao gave Goryeo permission to incorporate the land between the border of Liao and that of Goryeo, which was occupied by Jurchen tribes that were troublesome to Liao, up to the Yalu River. In spite of the settlement, Goryeo continued to communicate with Song, having strengthened its defenses by building fortresses in the newly gained northern territories.

...
Wikipedia