As the relationship between master and vassal among samurai was highly dependent on interests, at times vassals would abandon a Bumon no toryo, if and when they came under an unfavorable situation due to a war and changed loyalty to the opponent.
特に武士間の主従関係においては利害が如実であり、不利な戦況にある武門の棟梁の下から去り、敵対勢力への鞍替えをしたり、背く場合もあった。