When Tora was nineteen, in May 28 1193 (old lunar calendar), the brothers sneaked under the darkness of night into the hunting grounds at the foot of Mt. Fuji held by MINAMOTO no Yoritomo and executed their revenge on Suketsune KUDO for their father's death.
そして虎が19歳の年、建久4年（1193年）5月28日(旧暦)に源頼朝が催した富士の裾野での狩りに夜陰に乗じて忍び込んだ兄弟は、父の仇の工藤祐経を討ち取る。