There has been a lot on the UK news today and yesterday about the Christmas Truce in 1914, when hostilities temporarily stopped for a game of football: this seems to have been verified as actually happening, although more likely about this date than on Christmas Eve itself. I am reminded of Mike Harding's song which he wrote some years back: there is a re-mastered version out with 50%of profits going to The Royal British Legion and Help for Heroes.
The lyrics are in the DT: the newest video is here:
https://www.youtube.com/watch?v=HqaCSnyRMO8