Premise: Artur Edler von Mecenseffy (23 June 1865, Vienna — 6 October 1917, Asiago) was an Austro-Hungarian Army officer who held the rank of "Feldmarschall-leutnant" ("lieutenant field marshal") and served during World War I, becoming the highest ranking officer of Austria-Hungary to be killed on the battlefield.
Hypothesis: No other "Feldmarschall-leutnant" Austro-Hungarian officers were killed on the battlefield in World War I than Mecenseffy.