Nobumoto (uncle of Tokugawa Ieyasu) in his castle of Ogawa, who defected from the Imagawa in favor of an alliance with Oda Nobunaga. In 1558, Yoshimoto send Matsudaira Motoyasu to attack Terabe Castle, but were driven off by reinforcements sent by Oda Nobunaga. Later, Yoshimoto left the clan's political affairs in Imagawa Ujizane's hands, in order to focus on dealing with the advance westward into Mikawa and Owari. Death Battle of Okehazama In the summer of 1560, after forming a three-way alliance with the Takeda and the Hōjō, Yoshimoto headed out to the capital with Matsudaira Motoyasu (later known as 'Tokugawa Ieyasu') of Mikawa in the vanguard. Despite having a strong force of 25,000, Yoshimoto deliberately announced that he had 40,000 troops. While this statement put fear in many factions, Oda Nobunaga of Owari Province saw through it. (Some historical sources support the claim of 40,000.) After capturing several castles from the Oda clan, Yoshimoto's army let its guard down, celebrating with song and sake. However, a surprise attack by the Oda Nobunaga army of 3,000 following a downpour left Yoshimoto's army in complete disorder. Two Oda samurai (Mōri Shinsuke and Hattori Koheita) ambushed the Imagawa army and killed Yoshimoto in the village of Dengakuhazama. Imagawa Ujizane succeeded to family headship after Yoshimoto's death, but the Imagawa clan fell from power. Ujizane was later summoned by Tokugawa Ieyasu and became a kōke in the administration of the Tokugawa clan. Yoshimoto's niece was Lady Tsukiyama, the wife of Tokugawa Ieyasu. Yoshimoto has several graves; his body itself is buried at Daisei-ji, a temple in the city of Toyokawa in modern Aichi Prefecture. Family Father: Imagawa Ujichika Mother: Jukei-ni (d. 1568). Wife: Jōkei-in (1519–1550) Concubine: Ii Naohira's daughter Children: Imagawa Ujizane by Jōkei-in Chotoku Ichigetsu (d. 1625) by Jōkei-in Reishō-in (d. 1612) married Takeda Yoshinobu by Jōkei-in Daughter (隆福院) daughter married Mure Katsushige Appearances in popular fiction See People of the Sengoku period in popular culture. He is a playable character in Pokémon Conquest (Pokémon + Nobunaga's Ambition in Japan), with his partner Pokémon being Pineco and Forretress. In the Samurai Warriors series, Yoshimoto is represented as a foolish old-fashioned nobleman. His weapon is a kemari which is inspired by his son, Ujizane's historical obsession towards kemari. In Samurai Warriors 5, however, where he fights with a warhammer and his ancestral katana Samonji, he is instead portrayed as an arrogant but effective