 He captured castles at Ishikawa, Daikoji and Aburakawa, and soon gathered support of many former Nanbu retainers in the region.After pledging fealty to Toyotomi Hideyoshi, he was confirmed as an independent warlord in 1590 and changed his name to "Tsugaru", formally establishing the Tsugaru clan.Tsugaru Tamenobu assisted Hideyoshi at the Battle of Odawara, and accompanied his retinue to Hizen during the Korean Expedition.