Battle of Verdun
1792 CE.
Shown on the map at 49.161°, 5.388°.
The Battle of Verdun was fought between 29 August and 2 September 1792 between French Revolutionary forces and a Prussian army during the opening months of the War of the First Coalition. The Prussians were victorious, gaining a clear westward path to Paris.
Text from the Wikipedia article Battle of Verdun (1792), licensed CC BY-SA 4.0.