Battle of St. Quentin
1914 CE.
Shown on the map at 49.901°, 3.628°.
The Battle of St. Quentin (also called the First Battle of Guise, French: 1ere Bataille de Guise) was fought from 29 to 30 August 1914, during the First World War.
Text from the Wikipedia article Battle of St. Quentin (1914), licensed CC BY-SA 4.0.