Battle of Barnaul
1918 CE.
Shown on the map at 53.366°, 83.750°.
The Battle of Barnaul was a series of engagements from 13 June to 15 June 1918, during the Russian Civil War. The battle involved several; different factions in the Siberian region. The Red Guards and White movement were the main combatants.
Text from the Wikipedia article Battle of Barnaul (1918), licensed CC BY-SA 4.0.