The 'battle of Mimasetoge' took place in
1569, as the forces of
Takeda Shingen withdrew from repeated failed sieges of the
Hōjō clan's
Odawara Castle. The Hōjō forces, led by the brothers
Ujiteru and
Ujikuni, laid in wait for him in the pass of Mimase. The Takeda vanguard, which included
Baba Nobuharu, was hard-pressed; Shingen himself led up the Takeda main body. The battle turned in favor of the Takeda when
Yamagata Masakage launched a furious counterattack, inflicting heavy casualties on the Hôjô. The Hôjô were defeated and forced to retreat north, allowing the Takeda to return to Kai - though leaving behind some 900 dead.
Reference
★ Turnbull, Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co.