 He accepted an invitation from Admiral Sankichi Takahashi to be the martial arts instructor at the Imperial Japanese Naval Academy, and also taught at the Nakano Spy School, although aikido was later judged to be too technical for the students there and karate was adopted instead.He also became a visiting instructor at the Imperial Japanese Army Academy after being challenged by (and defeating) General Makoto Miura, another student of Takeda Sōkaku's Daitō-ryū.Takeda himself met Ueshiba for the last time around 1935, while Ueshiba was teaching at the Osaka headquarters of the "Asahi Shimbun" newspaper.