You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.
Q: Context : Hans von Freden was born on 18 March 1892 in Berlin. 
Subject : Hans von Freden 
Relation : conflict
A: 
In which war did Hans von Freden fought?