Hōjō Ujiyasu
Musashi-Matsuyama, situated in Japan's Musashi province (today Saitama prefecture), is so called simply to distinguish it from the other locations known as Matsuyama Castle throughout Japan. Retaken by the Uesugi, who held it originally before the Hōjō siege twenty-six years earlier, it came under siege from the Hōjō and Takeda very soon after it was regained. The besieging army, under the command of Takeda Shingen and Hōjō Ujiyasu, employed a team of miners to dig under the castle's defenses, allowing the greater portion of their force easier access to their target.