Ōtomo clan
In 1539 Ōuchi Yoshitaka fought the Ōtomo clan and Shōni clan of northern Kyūshū, defeating the Shōni clan to win control of the area. In the same year, Sato-Kanayama Castle (佐東銀山城) owned by the Takeda clan on the Amago side fell to the Ōuchi clan despite reinforcements from the Amago clan. The family head Takeda Nobuzane (武田信実) escaped to Wakasa (若狭) where the Takeda had a branch family and later took refuge with the Amago clan.