“Snoopy’s Christmas” is a song by The Royal Guardsmen about the Peanuts character Snoopy setting aside his differences with the Red Baron on Christmas Eve. It was recorded in 1967 and continues to be popular on “oldies” radio stations.
Although the song is fictional, it’s similar to a real truce that occurred during World War I. According to Wikipedia, “During World War I, in 1914, “The Christmas Truce” was initiated not by German and British commanders, but by the soldiers themselves. The amount of time varied according to the area and has been reported as being anything from Christmas Day to Christmas Day through New Year’s Day. Trench-bound combatants exchanged small gifts across the lines, with Germans giving beer to the British, who sent tobacco and tinned meat to the Germans. “No Man’s Land” was cleared of dead bodies, trenches were fixed and drained, and troops from both sides shared pictures of their families and, in some places, used “No Man’s Land” for friendly games of football.”