The Omi forces including Yoshitsune YAMAMOTO and Yoshikane KASHIWAGI held Lake Biwa with their navy, and built a float bridge at Seta using small boats and rafts to stop transportation of nengu (annual tribute) from Hokurikudo region.
山本義経・柏木義兼ら近江勢は水軍をもって琵琶湖をおさえ、また小舟や筏を使って勢田に浮橋をかけて北陸道からの年貢の輸送を止めた。