It was because the military force required to sustain peace in Kyoto was not enough with just a military officer and zuijin (a guard) from old, and the 'house of tsuwamono' that served as the 'choka no soga' during TAIRA no Masakado's War started to provide 'mu' as a 'family business.'
それは、京の治安維持に必要な武力が、旧来の武官や、随身だけでは間に合わなくなり、平将門の乱での「朝家の爪牙」の役を果たした「兵の家」が、「家業」として、「武」を請け負いはじめるということでもあった。