a. It is so unclear from the lines give if the speaker is a German soldier.
b. The speaker thinks that they could be dreaming because the scene is so unexpected and surreal.
c. The falling snow is a symbol of peace and calm in these lines.
From the line above, It's not clear from the lines if the person speaking is a soldier from Germany. The speaker does not say where they are from or what group they belong to.
So, The person talking feels like they might be dreaming because what they are seeing is very strange and doesn't seem real. They are in the middle of a place where there is a lot of fighting, but they see a German soldier standing calmly in the snow. The difference between the war violence and the peaceful scene makes the speaker wonder if they are asleep or dreaming.