In the July after the Yongin Battle, he hastily joined forces with Yoshiaki KATO and Yoshitaka KUKI to take on the naval forces of Yi Sun-sin but Yasuharu WAKISAKA, eager for glory, went out alone and, at the Battle of Hansan Island, was thoroughly defeated by Yi Sun-sin.
龍仁戦闘の直後の翌7月には李舜臣による水軍の活動を抑えるために加藤嘉明、九鬼嘉隆と共に急遽連合水軍として編成されるが、功を逸って単独で抜け駆けした脇坂安治は閑山島海戦で李舜臣に大敗した。