Because of Yuzan's extensive knowledge, he was invited as a guest to lecture on military science by some feudal clans including that of Asano-Hiroshima in the Geishu district, Matsudaira-Aizu, Matsudaira-Fukui in the Echizen district.
その博識を買われ芸州浅野広島藩、松平会津藩、越前松平福井藩などに客分として迎えられて軍学を講じた。