The took place during

Takeda Shingen , of Kai Province, was a pre-eminent ''daimyō'' in feudal Japan. Known as the "Tiger of Kai", he was one of the most powerful daimyō with exceptional military prestige in the late stage of the Sengoku period. Shingen was a warlord of great ...

's campaign to take over

Shinano Province or is an old province of Japan that is now Nagano Prefecture. Shinano bordered on Echigo, Etchū, Hida, Kai, Kōzuke, Mikawa, Mino, Musashi, Suruga, and Tōtōmi Provinces. The ancient capital was located near modern-day Matsumoto, whi ...

. His army, led by

Sanada Yukitaka was a Japanese samurai warrior of the Sengoku period. He is known as one of the "Twenty-Four Generals of Takeda Shingen". He was the father of Sanada Nobutsuna and Sanada Masayuki and grandfather of the legendary samurai warrior Sanada Yukimur ...

, began besieging the castle in 1550. The defending lord,

Murakami Yoshikiyo Murakami Yoshikiyo (村上義清, 1501–1573) was a Japanese samurai from the and retainer of the Uesugi clan during the Sengoku period of the 16th century. Yoshikiyo followed in fighting against both Takeda Nobutora and his son Takeda Shingen ...

, held out until the following year, but his garrison suffered over 1000 casualties, and was ultimately forced to surrender. Toishijyo

References

*Turnbull, Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co. Toishi 1550 1550 in Japan 1551 in Japan Conflicts in 1550 Conflicts in 1551 Toishi 1550 {{Japan-battle-stub