Since he participated in the Eastern Camp and rendered distinguished war service in the Battle of Sekigahara in 1600, Yasumasa was granted additional properties bearing 8,000 koku after the Battle, and ranked with lords as daimyo (Japanese feudal lord) possessing properties bearing 15,000 koku in total.
慶長5年（1600年）の関ヶ原の戦いでは東軍に与して戦功を挙げたため、戦後に8000石を加増されて合計1万5000石を領する大名として諸侯に列した。