The siege of Uehara was the first of many steps taken by

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 ...

in his bid to seize control of Shinano Province. Uehara Castle had been controlled by

Suwa Yorishige (1516–1544) was a Japanese samurai and head of the Suwa clan. He was defeated by Takeda Shingen, and his daughter Suwa Goryōnin (諏訪御料人, real name unknown) was taken as Shingen's concubine. She later gave birth to the Takeda clan heir T ...

before it was taken by Shingen.

References

*Turnbull, Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co. 1542 in Japan Uehara 1542 Uehara 1542 Conflicts in 1542 {{Japan-battle-stub