Korean forces under general Kim Yu-sin of Silla defeat the army of Baekje in the Battle of Hwangsanbeol.
The Battle of Hwangsanbeol (Hangul: , Hanja: ) took place between the forces of Silla and Baekje in Hwangsanbeol (currently Nonsan) in 660.By the time King Muyeol was able to gain the support of Emperor Gaozong of Tang China to conquer Baekje. King Uija had led Baekje into demise as his parties and dissipation caused neglect for state affairs. In 660, Kim Yushin of Silla set out with fifty-thousand troops to rendezvous with the Tang army (size about: 122,711 to 130,000 men) which was being shipped over the sea. When King Uija heard of this crisis, he had already lost support from his ministers and only managed to rally five thousand men. He quickly appointed General Gyebaek as the commander of the armed forces, and sent him out to face Kim Yu-Shin in battle.
The Baekje army arrived at Hwangsanbeol first. Gyebaek set up camp and rallied his troops with a heroic speech. He reminded the soldiers of the armies of antiquity when Goujian defeated a seven hundred-thousand force with a mere five thousand. With this speech, the Baekje forces regained their strength, and prepared for a face off with the Silla forces.
Kim Yu-Shin soon arrived, and the Silla forces attempted a full attack on the Baekje forces. However, fighting to the death, the Baekje forces soon repelled the enemy, repulsing them five times. The Silla forces gradually lost morale, and the General Kim Pumil sent his young son and Hwarang, Gwanchang, to single-handedly go out and fight the enemy. Gwanchang was captured by the Baekje forces at first and was released by Gyebaek. The young hwarang then returned to the Silla base only to once again charge out at the enemy. Gyebaek captured him once more, and because he respected his young enemy, he executed Gwan Chang and sent his body to the Silla base.Through Gwanchang's martyrdom, the Silla forces' morale returned and Kim Yu-shin ordered a full attack on the dwindling Baekje forces. In the end, Kim Yu-Shin's Silla forces won and Gyebaek died in battle. Kim later stated that his enemy was a man of honor and bravery.
As this battle was the last Baekje resistance to Silla/Tang forces, Baekje soon fell when Kim Yu-Shin and the Chinese general So Jung-Bang surrounded Gongju and King Uija surrendered.
Kim Yu-sin (sometimes romanized Kim Yu-shin, Gim Yu-sin, or Gim Yu-shin) (595 – 18 August 673) was Korean military general and politician in 7th-century Silla. He led the unification of the Korean Peninsula by Silla under the reign of King Muyeol and King Munmu. He is said to have been the great-grandchild of King Guhae of Geumgwan Gaya, the last ruler of the Geumgwan Gaya state. This would have given him a very high position in the Silla bone rank system, which governed the political and military status that a person could attain.
Much of what is known about Kim's life comes from the detailed account in the Samguk Sagi, Yeoljeon 1-3, and the much briefer record in the Samguk Yusa, vol. 1.