However, they were dealt a crushing defeat in the battle of Ichinotani, which occurred in March, 1184, and fled by way of the sea, establishing strongholds at Yashima in Sanuki Province and Hikoshima in Nagato Province (today's Shimonoseki, Yamaguchi Pref.).
しかし、寿永3年/治承8年（1184年）2月の一ノ谷の戦いで大敗を喫して、海に逃れ讃岐国屋島と長門国彦島（山口県下関市）に拠点を置いた。