According to the book 'Journal of House Sitting in Edo' written by Hirofumi YAMAMOTO and other materials, the Mori clan reported to the bakufu after the clan destroyed castles such as Iwakuni-jo Castle while leaving Hagi-jo Castle in Nagato Province, then, the bakufu replied, 'Since the Mori clan owns only two provinces, Suo and Nagato, you did not have to destroy Iwakuni-jo Castle in Suo Province, additionally.'
山本博文著「江戸お留守居役の日記」等によると毛利家では長門国の萩城を残して岩国城などを破却し幕府に報告したが幕府の反応は「毛利家は周防国、長門国の二国だから周防国の岩国城まで破却する必要はなかった筈」というものであった。