The Siege of Osaka was a series of battles the Tokugawa shogunate overtook the Toyotomi clan during the late Warring States period in Japan. After these campaigns, Japan officially ended the Warring States period since the Onin war (begin of Warring States period).
Oda Nobunaga (織田信長), the head of the post-three unifiers during the Warring States period in Japan, withdrew from the stage of history after the Incident at Honnō-ji (June 21, 1582). He was originally a military commander who was most likely to end the Warring States period. Unfortunately, this was counterproductive.