"Ashikaga Kiseiki" (a military epic of Ashikaga) states that 'Matsunaga is a son-in-law of Naito - a provincial governor of Bizen, and he is a dependable man in the castle particularly; the losers attempted to take over the castle, but he threw them over and took all the credit of war' regarding the fierce fight at that time.
この時の奮戦ぶりを『足利季世記』によると、松永ハ内藤備前守ガ聟ナレバ、城中モ一入タノモシク思ヒケル、落武者カク計リケル事武功第一ナリト沙汰シケルと記載されている。