The vassals of Nobunaga who were in Kyoto at the time and the associates of Yoshiaki fought desperately and achieved successful defense; however, when Nobunaga heard the news he recognized the need for a castle with better defense and decided to build one for Yoshiaki.
このときは京にいた信長家臣団、及び、義昭の側近らの奮戦により防戦に成功するが、この報を受けた信長はさらに防備の整った城の必要性を認識し、義昭のために築城をすることを決めた。