Siege of Osaka
In October 20, 1600 at the Battle of Sekigahara, Tadaoki commanded 5,000 men in the Tokugawa vanguard and clashed with the forces of Shima Sakon. Afterwards, He was awarded a fief in Buzen (Kokura, 370,000 koku) and went on to serve at the Siege of Osaka (1614–1615).