During the Kamakura and later periods, the post was assigned to each province, and shogo in each province was responsible for selecting the gokenin to assume the post in the province (oban saisoku).
鎌倉時代以降は、各国に振り分けられ、各守護が責任者となり、国内の御家人に振り分けして指揮に当たった（大番催促）。