Battle of Un no Kuchi
1536 CE.
Shown on the map at 36.037°, 138.496°.
The Battle of Un no Kuchi (referred to in Japanese as 海ノ口城, un no kuchi jou, literally Un no Kuchi Castle) in 1536 was the first major victory for Takeda Harunobu, aged fifteen at the time. He would later take on the name Takeda Shingen, and grow to become one of Japan's most famous warlords.
Text from the Wikipedia article Battle of Un no Kuchi, licensed CC BY-SA 4.0.