This would assume that both sides believed that Jesus Christ was their Lord and Savior, and they were fighting over things other than 'religion'. The Allies and the Germans had a common belief in this regard.
Not the case here...not by a long shot. In fact, this 'war' (if only we fought it like one) has religion as a base cause, even though our government refuses to acknowledge that fact as it wouldn't be PC.
I think you are right, although Our Lord can use His power anywhere to create a Christmas miracle.