Yoshioki saw the resulting internal conflict within the Hosokawa clan as a good opportunity to invade Kinai region and, after ordering the mobilization of daimyo from Kyushu and Chugoku regions, departed Yamaguchi in December and had advanced into Bingo Province by January of the following year.
その後も細川氏内部では抗争が続いたため、畿内進出の好機と見た義興は、九州・中国の諸大名に動員令を発し、11月には山口から進発し、12月に備後国にまで進出した。