The marine control over the Seto Inland Sea and the dominance over Sanyodo (a Japanese term denoting an ancient division of the country, corresponding for the most part with the modern conception of the Sanyo region), Shikoku and Kyushu regions were seized by the Taira clan that had escaped to Saigoku (western part of Japan).
西走した平氏は瀬戸内海の制海権を握り、山陽道・四国・九州を掌握していた。