The steady connection between Shingen and his vassals was maintained through kishomon (sworn oath) in which a vassal pledged allegiance to Shingen in terms of minor conflicts between Shingen and a vassal or incidents such as Yoshinobu incident which cause confusion in the family, and by performing Shinto and Buddhist oaths.
信玄は家臣との間の些細な諍いや義信事件など家中の動揺を招く事件に際しては忠誠を誓わせる起請文を提出させており、神仏に誓うことで家臣との紐帯が保たれていた。