The Oda navy led by Yoshitaka KUKI encountered the Mori navy which entered into Osaka Bay to support Ishiyama Hongan-ji Temple and had a naval battle with them, then 600 ships of the Mori navy and the Murakami navy suffered a crushing defeat before the power of ozutsu and odeppo loaded onto the Oda navy's six armored warships.
九鬼嘉隆指揮の織田水軍は、石山本願寺支援のため大坂湾に入った毛利水軍と木津川口で海戦となり、織田軍の6隻の鉄甲船に搭載された大筒・大鉄砲の火力の前に毛利水軍・村上水軍600隻は惨敗した。