Second Battle of Champagne
1915 CE.
Shown on the map at 49.000°, 4.000°.
The Second Battle of Champagne (French: Bataille de Champagne, German: Herbstschlacht, [Autumn Battle]) in the First World War was a French offensive against the German army in Champagne that coincided with the Third Battle of Artois in the north and ended in a German victory.
Text from the Wikipedia article Second Battle of Champagne, licensed CC BY-SA 4.0.