Yoshinori, seeing this as an opportunity, joined forces with Norizane, ordered daimyos in Kanto to close Mochiuji off from power, officially identified Mochiuji as the Emperor's enemy following the imperial order to subjugate Mochiuji, and in 1439, took control of the Kanto area (Eikyo Rebellion).
義教は好機と見て憲実と結び、関東の諸大名に持氏包囲網を結成させ、持氏討伐の勅令を奉じて朝敵に認定し、1439年（永享11年）に関東討伐に至った（永享の乱）。