Question: Leopoldo Eleuteri was a flying ace in which deadliest conflct in history?
Sentence (from "World War I"): Over nine million combatants and seven million civilians died as a result of the war (including the victims of a number of genocides), a casualty rate exacerbated by the belligerents' technological and industrial sophistication, and the tactical stalemate caused by gruelling trench warfare.
Relevant evidence: No