Goryeo practiced the four majorities close to the Song Dynasty, but it was not because it was weak. They were the military powers of Dongi, who inherited Goguryeo's spirit-2-

 In the first part, we talked about the special class with a brief explanation of the title. In the Byeolmu class, there were cavalry Singi-gun, infantry Shinbo-gun, anti-ma-gun organized as monk soldiers, and special forces such as utterance, and Singi-gun wrote. Shinbo-gun. Although it is an ordinary Goryeo infantry group, it is an infantry group that moved differently from other troops under the name of the organization Byeolmuban organization. I think the armed state of the early Joseon Dynasty and the armed state of the Shinbo Army are almost similar. Hangma-gun. It is a group that shows the characteristics of Hoguk Buddhism, a type of Korean Buddhism. In other words, it means patriotism to protect the country with the power of Buddha, and Hangma-gun is an army made up of a group of monks. It consists of Suwon Seungdo, which is different from ordinary monks, and was the pre-ho (tenant) of the temple that cultivated the land owned by the temple. From the perspective of Hangma-gun, you can also get a glimpse of the society of the Goryeo Dynasty, which valued Buddhism more than Confucianism as a state religion. From the name of the special unit, it seems to be a unit specializing in chemical engineering. Due to the nature of the cavalry, it seems to be an corps that seems to have taken advantage of the weaknesses of a lot of maintenance costs (horse food, food). One of the weaknesses of the aftershocks, where cavalry units accounted for most of them, was horse food or food, and by burning or disusing all of the grass (food is also moved or not moved, it will play a role in reducing the morale of cavalry units. In addition, since the Yeojin were a race that built barracks and moved rather than building castles and settling there, they would have carried out various tasks such as guerrilla operations through arson and dedicated to attack signals. They can also be seen in connection with the use of gunpowder. Black gunpowder, which consists of three elements: cornerstone, sulfur, and charcoal, was invented in the year of Song Tae-jo, and Goryeo made extraordinary efforts to import advanced cultural properties over the boundaries of Song, so it is highly likely that they obtained gunpowder. The main force of the aftershocks and other Manchurians is cavalry on horseback, and the scary thing among them was the horse-riding palace. He used this tactic of approaching the advancing infantry at a high speed, shooting back at the enemy chasing after retreat, and at the same time, a cavalry who plays a hand-to-hand combat sticks to him and quickly shakes the camp and falls back. As it is described as Dongi (a nation that uses bows well in the east), the tribes of Manchuria and the Korean Peninsula used bows well. The reason for the use of the bow was that there were many forests, so guerrilla battles were more focused on the battle rather than the battle on a wide flatland, and those who used to hunt desperately needed 해. However, our people, who changed their businesses to agricultural peoples and settled down, need no words, which means that they are stirred because the use of cavalry is very low. As cavalry became less utilized and less useful, the effective training of cavalry and cavalry was insufficient, and the solution was the need for a combat unit called "support shooting" or backup in addition to cavalry. The active infantry could not overcome all the equestrian palaces, but they could use gunpowder to wipe away guerrillas of ambush cavalry, effectively carried out checks on equestrian palaces with stronger firearms, and could lead to a strategy of "sitting and destroying." The unit that used this gunpowder is "firing." By organizing gunpowder weapons called ignition and troops specializing in gunpowder operations, it led to the development of "powder use" technology, and it was an opportunity to effectively prevent Japanese invasions in the late Goryeo and early Joseon Dynasty.