Kim Yoo-Sin became a Hwa Rang at the age of 15 and was an accomplished swordsman by the time he was 18 years old. By the age of 34 he had been given the command of the Silla armed forces. He is regarded as the driving force in the unification of the Korean peninsula and the most famous of all the generals in the unification wars. Kim Yoo-Sin was active on all fronts in the wars, and at several times simultaneously conducted battles against both Paekche and Koguryo. He defeated the great Paekche general Gae-Baek in the battle in which Gae-Back was killed. Once, while Silla was allied with China against Paekche, a heated argument began between Kim Yoo-Sin's commander and a Chinese general. As the argument escalated into a potentially bloody confrontation, the sword of Kim Yoo-Sin was said to