On the other hand, Shigeuji was also attacked by Noritada IMAGAWA, who sided with UESUGI clan, and had to leave Kamakura, and then took refuge at the Koga-jo castle in Shimousa Province and used the name "Koga Kubo" (the Kyotoku War).
だが、成氏も上杉氏救援に駆けつけた今川範忠によって鎌倉を追われて下総国古河城を根拠として「古河公方」を名乗った（享徳の乱）。