The 'battle of Sezawa' was one of many battles fought by
Takeda Shingen in his bid to take control of
Shinano Province. Here, he was opposed by the combined forces of
Ogasawara Nagatoki,
Suwa Yorishige,
Murakami Yoshikiyo, and
Kiso Yoshiyasu, but defeated them all.
Reference
★ Turnbull, Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co.