Battle of Grandson
1476 CE.
Shown on the map at 46.817°, 6.633°.
The Battle of Grandson was fought on 2 March 1476, during the Burgundian Wars, and resulted in a major defeat for Charles the Bold, Duke of Burgundy, at the hands of the Old Swiss Confederacy.
Text from the Wikipedia article Battle of Grandson, licensed CC BY-SA 4.0.