Battle of Takatenjin
1574 CE.
Shown on the map at 34.698°, 138.035°.
The Battle of Takatenjin (高天神の戦い) was fought in 1574 between the forces of Tokugawa Ieyasu and the forces of Takeda Katsuyori. Katsuyori captured the Tokugawa fortress of Takatenjin, a feat which his father had unsuccessfully attempted. This attack was also displayed in the Akira Kurosawa film Kagemusha.
Text from the Wikipedia article Battle of Takatenjin, licensed CC BY-SA 4.0.