Battle of Mount Jupil

Battle of Mount Jupil
	Part of the First campaign in the Goguryeo–Tang War
	; Map showing the invasion of Goguryeo by the Tang forces from 645 to 668 AD
Date	June 23, 645 AD
Location	Near the fortress city of Ansi, northern Goguryeo (present-day Haicheng, Liaoning Province, China)
Result	Tang victory
Belligerents
Tang China	Goguryeo Korea
Commanders and leaders
Taizong of Tang; (Emperor of China); Li Daozong; (Imperial Prince of China); Zhangsun Wuji; (Duke of Zhao); Qibi Heli; (Duke of Liangguo); General Li Shiji; General Yuchi Jingde; General Xue Rengui; General Ashina She'er; General Qilibi Khan (WIA);	Yŏn Kaesomun; (Generalissimo of Goguryeo); General Ko Hyejin (POW); General Ko Yŏnsu (POW);
Strength
30,000 soldiers	150,000 soldiers
Casualties and losses
Unknown, but light	Entire force dispersed and destroyed; 36,800 surrendered

The Battle of Mount Jupil, also known as Battle of Jupil-san (Korean: 주필산_전투 Jupil-san Jeontu) and Battle of Mount Zhubi (Chinese: 驻跸山之战 Zhūbìshān Zhīzhàn) was a battle between Tang Chinese and Goguryeo Korean forces that took place in Mount Jupil at the south of the fortress city of Ansi. It took place on July 11, 645 AD. The small but elite Tang army wiped out the Goguryeo relief force trying to come to bolster the defenses of Ansi, achieving a major victory.