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?

Related documents: [0]  [DOC] The Battle of Verdun ("Bataille de Verdun", ] , "Schlacht um Verdun", ] ), fought from 21 February to 18 December 1916, was the largest and longest battle of the First World War on the Western Front between the German and French armies. The battle took place on the hills north of Verdun-sur-Meuse in north-east France. The German 5th Army attacked the defences of the Fortified Region of Verdun ("RFV, Région Fortifiée de Verdun") and those of the French Second Army on the right bank of the Meuse. Inspired by the experience of the Second Battle of Champagne in 1915, the Germans planned rapidly to capture the Meuse Heights, an excellent defensive position with good observation for the artillery to bombard Verdun. The Germans hoped that the French would commit their strategic reserve to recapture the position and suffer catastrophic losses in a battle of annihilation, not costly for the Germans because of their tactical advantage. [END] 
[1]  [DOC] Émile Augustin Cyprien Driant (11 September 1855 – 22 February 1916) was a French writer, politician, and army officer. He was the first high-ranking casualty of the Battle of Verdun during World War I. [END]  
Answer: from 21 February to 18 December 1916
from 21 February to 18 December 1916