Battle of Aizu
1868 CE.
Shown on the map at 37.300°, 139.560°.
The Battle of Aizu (Japanese: 会津戦争, romanized: Aizu sensō, lit. 'War of Aizu') was fought in northern Japan from October to November in autumn 1868, and was part of the Boshin War.
Text from the Wikipedia article Battle of Aizu, licensed CC BY-SA 4.0.