 Afterwards, he sided with Tokugawa Ieyasu during the Battle of Sekigahara in 1600.After the establishment of the Tokugawa Shogunate the Nanbu ruled the Shimokita Peninsula and the districts immediately to the south of it.The area to the west of the Nanbu's holdings and to the north of the lands held by the Akita clan were all controlled by the Tsugaru clan from their capital at Hirosaki.