At the time, since Nagasaki was the only city in Japan open to overseas, Shuhan, who grew up there, was astonished to find such a large gap between Japanese gunnery and Western gunnery, so he studied Dutch and foreign gunnery on his own, gathered firearms and so on with his private money, and in 1834, completed the Takashima ryu hojutsu.
当時、長崎は日本で唯一の海外と通じた都市であったため、そこで育った秋帆は、日本砲術と西洋砲術の格差を知って愕然とし、自らオランダ語や洋式砲術を学んで、私費で銃器等を揃え1834年（天保5年）に高島流砲術を完成させた。