As a result of the surprise attack by the Minamoto clan army led by MINAMOTO no Yoshitsune on the Taira family honjin (the camp of the supreme commander (Taira family)) in the Battle of Ichinotani, the Taira clan army lost many superior warriors and suffered a heavy blow.
一ノ谷の戦いで源義経率いる源氏軍に平家本陣に奇襲を受け、多くの有力武将を失い、大打撃をこうむった。