Battle of the Sambre
1918 CE.
Shown on the map at 50.467°, 4.867°.
The Second Battle of the Sambre (4 November 1918) (which included the Second Battle of Guise (French: 2ème Bataille de Guise) and the Battle of Thiérache (French: Bataille de Thiérache) was part of the final European Allied offensives of World War I.
Text from the Wikipedia article Battle of the Sambre (1918), licensed CC BY-SA 4.0.