Yes. I do remember watching a documentary about that event (it was spoken about) and two guys were interviewed about it and both of them were on opposing's sides. They had actually met each other and fought the next day, however, the American got shot and was pulled to safety by the German. Disguised the American as a German soldier, and then smuggled him through enemy territory as a "Shell shock" victim and was sent to Germany to where the German lived. Both of them made it, and were friends for years after.
No I do not remember what documentary about it. It was a very long (7.5 hour long) doc about "The great war"