Task: Question Generation
Input (English): Context : The Battle of the Barents Sea was a naval engagement on 31 December 1942 between warships of Nazi Germany's Kriegsmarine and British ships escorting convoy JW 51B to Kola Inlet in the USSR. 
Subject : Battle of the Barents Sea 
Relation : point in time
Output (English): When did Battle of the Barents Sea occur?