At the Battle of Sekigahara Tadataka belonged to the Eastern army, where he distinguished himself in the war through his services, and was thanked by Naifu (Hidetada TOKUGAWA).
関ヶ原の戦いでは東軍に属して種々の戦功をあげて内府（徳川秀忠）からの感謝状を得ている。