Sambyeolcho
The Sambyeolcho, or the Three Extraordinary Watches, was a military unit of the Goryeo dynasty while the Ch'oe family held the reins of power as military dictators behind puppet kings. They played a key role in resisting the Mongol Invasions of Korea.
History
Meaning "specially-selected troops", the Sambyeolcho originated from a unit called the Yabyeolcho, which was established to prevent burglaries and to provide night time security in the capital. When additional units were subordinated to the Yabyeolcho, the new organization was divided into two main units, the Jwabyeolcho, Special Unit of the Left, and the Ubyeolcho, the Special Unit of the Right.When a number of soldiers had been taken prisoner by the Mongols and then escaped, they were organized into a third force, the Sinuigun, and these three came to be known collectively as the Sambyeolcho. The Sambyeolcho performed both police and military functions but were elements of the private army of the Ch'oe family. Ch'oe U's private armies superseded and replaced the royal armies. The Sambyeolcho together with the Dobang comprised the means by which the Ch'oe family military dictators projected their power after their military coup usurped the royal power. The Sambyeolcho were disbanded when the Goryeo military regime collapsed.
The Sambyeolcho rose in rebellion in 1270 to protest against the strong ambition of the government. After establishing its own government and fighting for three years against the government, the rebellion was crushed by the Korean-Mongolian alliance in 1273.