Around the period of the Northern and Southern Courts (Japan), when the wars became intensified with group and the close attacks of walking troops, armor around the torso and belly bands became commonly used, and the large armor disappeared from the actual combat.
南北朝時代(日本)頃に集団戦・接近徒歩戦が盛んになると胴丸・腹巻が多く用いられるようになり大鎧は実戦から姿を消す。