Siege of Fushimi
1600 CE.
Shown on the map at 34.940°, 135.777°.
The siege of Fushimi was a crucial battle in the series leading up to the decisive Battle of Sekigahara which ended Japan's Sengoku period. Fushimi Castle was defended by a force loyal to Tokugawa Ieyasu's Eastern army, led by Torii Mototada. Knowing of his inevitable defeat, Torii's sacrifice diverted Ishida Mitsunari's attention, and part of his Western army, away from his Nakasendō fortresses, which were attacked by Tokugawa during the siege of Fushimi. Ultimately, the castle fell, but served a crucial role in allowing for greater strategic victories by Tokugawa.
Text from the Wikipedia article Siege of Fushimi Castle, licensed CC BY-SA 4.0.