 Conflict between Yoshioki and his rivals came to a head at the Battle of Nyoigatake on a summer night in 1509, when Yoshioki joined with Hosokawa Takakuni to defeat Sumimoto and Yukinaga in a large-scale battle.After Sumimoto and his supporters fled to their base in Awa Province in Shikoku, in 1510, Yoshioki and Takakuni invaded Ōmi Province, but lost overwhelmingly to "kokukjin" who backed Sumimoto.This encouraged supporters of Ashikaga Yoshizumi to plan for a final showdown by invading Settsu Province in the summer of 1511.