MINAMOTO no Yoritomo dispatched Yoshimochi WADA to kill Toshitsuna, but on October 8, 1183, Rokuro told Yoritomo through Yoshimochi that he had already killed his master Toshitsuna bringing his head to Yoritomo in a pledge of loyalty to Yoritomo.
同年9月13日、俊綱を討つべく源頼朝が派遣した和田義茂の使者を通じ、頼朝への忠節を示すべく主人たる俊綱を斬ったのでその首を持参したい旨頼朝に伝えた。