Nice to hear from you. Yes, I know the story very well. There is one legendary account of a young German soldier who came out of his trench and approached the British lines over no man's land, without prior notice carrying a makeshift tree, and was nearly shot except for the astonishment of the British.
I looked it up and it's called, get this, Joyeux Noël! I don't know if you were being sly Korbel or the movie producers tried to be as banal as they can possibly be... Maybe I'll watch it next year.