Task: Question Answering
Input (English): Context : Hans Howaldt (12 November 1888, Kiel -- 6 September 1970) was a successful and highly decorated German U-boat commander in the Kaiserliche Marine during World War I and also active in World War II. By the end of World War I he was promoted Kapitänleutnant. 
Question : In which war did Hans Howaldt fight?
Output (English): World War I