They used their kwan jyel sul for defending the monasteries. They also used their self-defense techniques to protect themselves from bandits and wild animals on their travels throughout the country. They spread these techniques and principles to China, Korea, and Japan. Kwan jyel sul took on other names, such as Chin-Na in China. Kwan jyel techniques were used by the military for defending their countries and driving off invaders.
Many styles incorporate the use of kwan jyel sul as part of their training.
The guards were not allowed to use weapons on the palace grounds unless it became absolutely necessary. Any intruder who happened to venture onto the palace grounds quickly found himself on the receiving end of a kwan jyel technique. Some of the women who attended to the needs of the ladies of the Korean royal court were also trained in the art of Koong Jong Mu Do, and thus, kwan jyel sul. In addition to their regular duties, these women were actually the bodyguards of the members of the royal court. They would gladly give up their lives for their lord or lady.