The Kamakura family's vassal clans that were appointed as new land stewards in western Japan included the Mori and Kumagaya clans of Aki Province, the Otomo clan of Bungo Province and the Chiba and Shibuya clans of Satsuma Province, and these great waves of migration are called by some the "Great Barbarian Invasion" in the history of Japan.
新補地頭として西日本へ移住した御家人には、安芸国の毛利氏・熊谷氏、豊後国の大友氏、薩摩国の千葉氏・渋谷氏などがおり、かなり大規模な移住だったため、「日本史上の民族大移動」と評する論者もいる。