However, in May 1471, he was offered a secret agreement on authorization to act as regional military governor by Shogun Yoshimasa and Katsumoto HOSOKAWA, and shifted sides to join the Eastern squad.
ところが、孝景は、文明_(日本)3年（1471年）5月、将軍義政及び細川勝元から、守護権限行使の密約をもらって東軍に寝返る。