Question: Émile Driant was the first high-ranking casualty in the largest  and longest battle of the First World War on the Western Front between the German and French armies, fought when?
Sentence (from "Battle of Hürtgen Forest"): The Battle of Hürtgen Forest (German: "Schlacht im Hürtgenwald" ) was a series of fierce battles fought from 19 September to 16 December 1944 between American and German forces on the Western Front during World War II in the Hürtgen Forest about 50 mi2 east of the Belgian–German border.
Relevant evidence: No