I remember seeing a program on TV about the battle of Monte Cassino. One German soldier who was interviewed many years later said the British troops were trying to attack them by climbing the nearly vertical mountain.
He said the Officer who ordered the attack must have been crazy. A large number of British troops were killed. During a lull in the battle the Germans offered them a truce to collect their wounded and dead. The program said the German medics and soldiers even helped collect them and temporarily treat them.
I think the fact that both sides were largely Christian played a part in it.
I saw years ago a Hallmark Tv movie with Linda Hamilton playing the widow in a true story about a German mother and son allowing German and American soldiers in for Christmas supper (they were caught in a snow storm)...as long as both parties don’t shoot each other during Christmas eve and eat like civilized people.
Thought the same thing: two Chritian nations and shared values. We couldn’t do that with the Japanese in WWII or the Muslims now.