Battle of Fort d'Issy
1871 CE.
Shown on the map at 48.817°, 2.269°.
The Battle of Fort d'Issy took place in April and May 1871 between the Paris Commune and Versaillais government forces at Fort d'Issy, south of Paris, France.
Text from the Wikipedia article Battle of Fort d'Issy, licensed CC BY-SA 4.0.