Yoshitsune, fresh off his victory at the battle of Okushima in March, 1185, spent a month resupplying and readying his army, and won over warriors possessing significant naval forces like Tsunenobu KANO and Masatoshi FUNATO as allies, establishing his control over the Seto Inland Sea.
文治元年（1185年）2月、屋島の戦いに勝利した義経は、1箇月かけて軍備を整えつつ河野通信や船所正利など水軍勢力を味方に引き入れ、瀬戸内海の制海権を握っていった。