On the night of the raid, Jinzaburo guarded nearby spots outside the gate, and when the Ako Roshi group was leaving for the Sengaku-ji Temple, he walked around handing mandarin oranges and rice cakes and expressing congratulations to the members.
討ち入り当夜は門外で周辺を警備し、赤穂浪士一行が泉岳寺へ引き揚げる際、甚三郎は祝意を表しながら浪士たちに蜜柑や餅を手渡して回った。