On the day of the incident, 12 members including Sanosuke HARADA waited in Sanjo kaisho (a meeting place in Sanjo), 10 members including Kuwajiro OISHI waited in a merchant house, 12 members including Tadao ARAI waited in a liquor store, and two more members including Kaoru ASANO were arranged as patrols, waiting for the appearance of masterless samurai.
事件当日は三条会所に原田左之助ら12名が、町屋に大石鍬次郎ら10名が、そして酒屋に新井忠雄ら12名が配置された上に、さらに斥候として浅野薫ら2名が配置されて不逞浪士の出現を待ち構えていた。