In 1467, the following year, when the Onin War began, Takatada, along with Mochikiyo, led 10,000 soldiers to join the Eastern Camp including Katsumoto HOSOKAWA, overpowering the Western Camp including Takayori ROKKAKU and subsequently building Nyoigatake-jo Castle in Yamashiro Province.
翌応仁元年（1467年）、応仁の乱が勃発すると持清と共に一万の兵を率いて細川勝元ら東軍に属し、西軍の六角高頼らを圧倒して、山城国に如意岳城を築いた。