How many did the flamethrower kill in World War 1?

The flamethrower was used by various armies during World War I, primarily by the Germans and the Allies, but its overall effectiveness in terms of casualties is difficult to quantify. Estimates suggest that flamethrowers caused several thousand deaths, but precise figures are not well-documented. Their psychological impact on troops was significant, as they instilled fear and terror on the battlefield. Overall, while they contributed to the war's brutality, flamethrowers were not the primary weapon of mass casualties.