In 1588, construction was completed on , where he immediately moved. Ujisato took part in all of Hideyoshi's subsequent campaigns: Kyushu Campaign, the Siege of Odawara (1590), the pacification of Ōshū (Mutsu and Dewa Provinces) (1590), and the Japanese invasions of Korea. For his role in the pacification of Ōshū, he received a 420,000 "koku" fief with its headquarters at Kurokawa Castle in Aizu. He renamed the castle Wakamatsu, the name which even the town retains to this day.