Although he took the Retired Emperor Gotoba's side in the Jokyu War in 1221, Michinobu returned to his territory with Michimasa when the Retired Emperor side was defeated, and they continued resistance by confining themselves in Takanawayama-jo Castle.
通信は承久3年（1221年）の承久の乱で後鳥羽天皇方につくが、上皇方が敗北すると通政と共に領地へ戻り、高縄山城に籠もって反抗を続けた。