Task: Question Generation
Input (English): Context : ``Karl-Gerät'' (040/041) (German literally ``Karl-device''), also known as Mörser Karl, was a World War II German self-propelled siege mortar (Mörser) designed and built by Rheinmetall. 
Answer : World War II
Output (English): What is the war during which Karl-Gerät was in the armed forces?