When Yoritomo received Prince Mochihito's order and decided to defeat the Taira clan in 1180, Tsunetaka followed him and on the 17th of August, Tsunetaka went to the house of Nobuto TSUTSUMI, who was regarded as a great warrior, to kill him with Kanetaka YAMAKI as his guardian.
治承4年（1180年）、伊豆国で以仁王の令旨を受け平氏打倒を決意した頼朝に従い、8月17日、山木兼隆の後見で勇士とされた堤信遠を討つべくその邸宅へと赴いた。