"Nihonshoki" (Chronicle of Japan), which recorded the details of the war, scarcely described the origin of the soldiers gathered up for the war, therefore, historians have been studying and discussing it for a long time.
『日本書紀』は乱の経過を詳しく伝えるが、動員された兵力の性格について語る箇所は少なく、長く歴史学者の間で学説上の争点になっている。