For this reason, Tanemichi HATANO and Kataharu YANAGIMOTO, who were Motomori KOZAI's siblings, led a rebellion against Takakuni HOSOKAWA at Yakamijo Castle as well as at Kannosanjo Castle, and they won the Battle of Katsurakawara with the support of Harumoto HOSOKAWA, who was the provincial constable of Awa Province, and Goro AKAI, who was the master of the Kuroijo Castle.
このため、香西元盛の兄弟の波多野稙通と柳本賢治は、細川高国に八上城・神尾山城両城で反旗を翻し、阿波国守護細川晴元や黒井城主の赤井五郎の援軍を得て、桂川原の戦いで勝利した。