Date. This resulted in Yoshitsugu kidnapping Masamune's father Terumune during their meeting in Miyamori Castle, where Terumune was staying during the time. The incident ended with Terumune and Yoshitsugu killed as the fleeing Nihonmatsu party clashed with the pursuing Date troops near the Abukuma River. Due to the death of Date Terumune by the hands of Nihonmatsu Yoshitsugu, Masamune swore vengeance. In January 1586, Masamune had his revenge by launching an attack against the Nihonmatsu at the Battle of Hitotoribashi. Various records of the event exist, although they present different accounts of its circumstances. The Date clan fought many battles with their neighbours afterwards, including the Battle of Koriyama in 1588, the Siege of Kurokawa and the Battle of Suriagehara in 1589. After defeating the Ashina clan, Masamune made Kurokawa Castle in Aizu domain his base of operations. Service under Hideyoshi In 1590, Toyotomi Hideyoshi seized Odawara Castle and compelled the Tōhoku-region daimyō to participate in the campaign. Although Masamune refused Hideyoshi's demands at first, he had no real choice in the matter since Hideyoshi was the virtual ruler of Japan. Masamune still delayed, infuriating Hideyoshi. Expecting to be executed, Masamune, wearing his finest clothes and showing no fear, faced his angry overlord. Not wanting further trouble, Hideyoshi spared his life, saying that "He could be of some use." Being a major power in northern Japan, Masamune was naturally viewed with suspicion, as any potential rival would be viewed. Toyotomi Hideyoshi reduced the size of his land holdings after his tardiness in coming to the Siege of Odawara against Hōjō Ujimasa. In 1591, Masamune forfeited the ancestral land of the Date Clan (present day Date City, Kawamata, Koori, and Kunimi) to Hideyoshi, causing widespread riots. He never regained the territory. After he fought against Kunohe Rebellion, he was given Iwatesawa and the surrounding lands as his home domain. Masamune moved there, rebuilt the Iwadeyama Castle, renamed it Iwadeyama, and encouraged the growth of a town at its base. Masamune stayed at Iwadeyama for 13 years and turned the region into a major political and economic center. He and his men served with distinction in the Hideyoshi Korean invasions In 1592–1598. Service under Ieyasu In 1598, after Hideyoshi's death, Masamune began to support Tokugawa Ieyasu—apparently at the advice of Katakura Kojūrō. Tokugawa Ieyasu increased the size of his lands again, but was constantly suspicious of Masamune and his policies. Although Tokugawa