Question: What was the ground force of the Austro-Hungarian Dual Monarchy that Jan Romer joined?
Sentence (from "Austro-Hungarian Army"): The Austro-Hungarian Army (German: "Landstreitkräfte Österreich-Ungarns" ; Hungarian: "Császári és Királyi Hadsereg" ) was the ground force of the Austro-Hungarian Dual Monarchy from 1867 to 1918.
Relevant evidence: Yes