as head of the Amago. The shōgun, Ashikaga Yoshiteru wished for peace between the Amago and Mōri clans, but Motonari ignored his plea and invaded Izumo Province in 1562. So began the Second Siege of Toda Castle. Second Siege of Toda castle The Second Siege of Toda Castle lasted from 1562 to 1563. When Motonari attacked Amago Yoshihisa at Toda Castle, Yoshihisa executed his retainer, Moriyama Hisakane (宇山久兼), whom Yoshihisa feared would betray him. This caused most of his remaining troops to desert, and later Amago surrendered to Motonari. Yoshihisa was permitted to become a monk and was held captive at Enmei-ji. With the head of the Amago clan gone, the clan members were forced to serve as retainers to other daimyo. As a monk, Yoshihisa changed his name to Yurin (友林). After Mōri Terumoto became the head of Mōri clan, he became a retainer under Terumoto. After defeating the Amago clan in Izumo Province, Motonari had become lord of eight provinces of the Chūgoku region. However, Amago Katsuhisa, son of Amago Masahisa (尼子誠久), led a remnant of the clan in rebellion with support from Yamanaka Yukimori. Motonari's eldest son, Mōri Takamoto, while en route to attack the Amago clan in 1563, died of a sudden disease, though assassination by poison was suspected. Saddened and angered by his death, Motonari ordered all those whom he thought responsible to be punished. In 1566, Takamoto's son and Motonari's grandson Mōri Terumoto was selected as Motonari's heir, but Motonari continued to wield the true power over the Mōri clan. In 1570, Terumoto defeated Amago Katsuhisa at the Battle of Nunobeyama. Katsuhisa then fled to the Oki Islands. In 1578, Katsuhisa returned from the Oki Islands and captured Tajima and Inaba Provinces. He then occupied Kozuki Castle for Oda clan under Toyotomi Hideyoshi, and defended it against the Mōri clan. Later, he was attacked by Kobayakawa Takakage and Kikkawa Motoharu, defeated and forced to commit suicide. Conflict with Ōtomo After Ōuchi Yoshinaga, Otomo Sorin's younger brother, was forced to commit suicide by the advance of Mōri forces in 1557, Mōri Motonari captured Yoshinaga's Moji fortress in 1558. In response, Otomo Sorin recaptured the castle in September 1559, but the Mōri, led by Kobayakawa Takakage and Ura Munekatsu, quickly took the castle back. In 1561, forces under Ōtomo Sōrin attacked the Moji castle in alliance with the Portuguese trader, but the assault failed, and the