But over the issue on exclusion of foreign ships from Yokohama port, a political confrontation occurred between Yoshinobu who insisted the principle of limited expulsion of foreigners (in favor of exclusion) and Hisamitsu, Shungaku and Munenari who insisted reinforcement of armaments (against exclusion).
しかし、孝明天皇が希望する横浜港鎖港をめぐって、限定攘夷論（鎖港支持）の慶喜と、武備充実論（鎖港反対）の久光・春嶽・宗城とのあいだに政治的対立が生じた。