Hashiba Hideyohi (later Toyotomi Hideyoshi), a retainer of Oda Nobunaga, went on an expedition to the Chūgoku region to reunify Japan in 1582. Muneharu resisted Hideyoshi, locking himself in Bitchu Takamatsu Castle. Hideyoshi advised Muneharu to surrender on the condition that Muneharu give him Bitchu Province, but Muneharu refused. Takamatsu Castle was flooded by Hideyoshi and nearly fell (this strategy was worked out by Kuroda Yoshitaka, who was on the staff of Hideyoshi). Shimizu's grave is at Seikyō-ji, Hikari, Yamaguchi Prefecture.