Masanori UESUGI, who was the head of Horikoshi Kubo (also called Horigoe Kubo, shogunal deputy based in Horigoe, Izu Province) and Dokan OTA, the chief retainer of the Ogigayatsu-Uesugi clan, intervened in the succession dispute by leading forces into Suruga Province.
堀越公方執事の上杉政憲と扇谷上杉家家宰の太田道灌が兵を率いて駿河国へ進駐して家督争いに介入。