Since the exclusion of foreign ships from the Yokohama port was rejected by the U.S. and the Netherland, the bakufu tried to have a conference with the envoys of the U.S., Britain, France and Russia to persuade them to cooperate on October 31.
米蘭との交渉で鎖港を拒否された為、今度は10月31日（旧暦9月19日(旧暦)）に、米・英・仏・露の4カ国公使と会見しての説得を試みた。