Task: Question Generation
Input (English): Context : At 0930 hours on 15 May 1918, Oberleutnant Walter Ewers was killed in action while piloting his Albatros D.V in combat over Villers-Bretonneux with No. 65 Squadron RAF. 
Subject : Walter Ewers 
Relation : conflict
Output (English): Which war did Walter Ewers participate in?