Among those who worked under the bakufu's office and were nominally hired only in one generation, the '与力' (yoriki, a police sergeant) was originally '寄騎' (yoriki, lower-ranked samurai), that is, they were in the class of cavalry warriors who came from the bushi who established a temporal master-subordinate relationship every time war happened and were 'samurai,' and doshin (a police constable) were 'kachi.'
幕府の役所の下役で一代限り雇用名目の者達のうち、与力は本来は寄騎、つまり戦のたびに臨時の主従関係を結ぶ武士に由来する騎馬戦士身分で「侍」、同心は「徒士」である。