Siege of Minakuchi

During the Battle of Sekigahara, Natsuka was loyal to the Western Army under Ishida Mitsunari, but was unable to participate in any combat.^[2] After the defeat of the Western Army at the Battle of Sekigahara, Natsuka fled to Minakuchi Okayama castle, but was pursued by the Tokugawan generals, who immediately laid siege to the castle. Natsuka promptly set fire to the castle and committed seppuku before the Tokugawan forces could reach him.^[1][3]

Following the defeat of Natsuka's forces, the castle was seized as tenryō by the Tokugawa shogunate. Natsuka was later buried at Anraku-ji, in Shiga Prefecture.