Toyotomi Hideyori
The was fought in 1615 between the forces of Tokugawa Ieyasu and Toyotomi Hideyori. Tokugawa was besieging Osaka, and Hideyori had planned a counterattack. Both sides were plagued by mistakes until Hideyori's side finally fell. He presumably committed suicide. The Toyotomi army suffered nearly 50% casualties in this battle, with more than 15,000 dead. This was also the final battle of Sanada Yukimura.