Battle of Kuisegawa
1600 CE.
Shown on the map at 35.389°, 136.576°.
The Battle of Kuisegawa (杭瀬川の戦い) was a decisive battle during the Sekigahara Campaign, this battle gave Ishida Mitsunari's Western Army the initial advantage at the Battle of Sekigahara while Tokugawa Ieyasu's Eastern Army suffered heavy losses and had to retreat to Sekigahara.
Text from the Wikipedia article Battle of Kuisegawa, licensed CC BY-SA 4.0.