At the end of the 9th century, false registration, vagrancy, or escape by farmers became prominent; therefore, it was difficult to know for each household who could be mobilized in military affairs.
9世紀末頃になると、百姓らの偽籍・浮浪・逃亡が顕著となり、軍事動員の対象となるべき百姓を各戸ごとに把握することが困難となった。