Instructions: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Input: Context : Robert Martinek (2 February 1889 -- 28 June 1944) was an artillery officer in the Austro-Hungarian Army during World War I, the Austrian Bundesheer and, during World War II, in the Wehrmacht Heer, who came to be regarded as one of the most skilled artillerymen of his generation.
Answer : World War I
Output:
What war or battle did Robert Martinek fight in?