But because communication between patrolmen and inhabitants proved difficult due to the multiple languages spoken there, in 1864 the bakufu concluded an arrangement with the four countries of Great Britain, the United States, France, and the Netherlands, under which the autonomous settlement organization called the 'Settlement Party' would establish a police force.
しかし言語等で意思の疎通を欠いていたため、1864年に幕府はイギリス・アメリカ合衆国・フランス・オランダの四カ国と協定を結び、居留地の自治組織である「居留地会」が警察を設置することになった。