In the first place, Heike no Ochudo were fugitives of the Taira family side who were repeatedly defeated in the Battle of Ichi no tani, the Battle of Yashima and the Battle of Dan no ura during the Genpei War in which Seiwa-Genji (Minamoto clan) and the Taira family fought a decisive battle.
そもそも平家の落人とは、清和源氏と平家とが雌雄を決した源平合戦で一ノ谷の戦い、屋島の戦い、壇ノ浦の戦いにおいて平家方が連戦連敗を繰り返した中で発生した平家方の難民である。