The theme of my daughter's high school Christmas pageant this year was that 100 years ago, on Christmas Eve in France, the Germans, French and English stopped fighting, got out of their trenches, sang Silent Night together and then shook hands, exchanged photos, even started a soccer game. It was supposed to be a great moment for peace.
What they neglected to mention was that there would be another 4 years of incredibly stupid, pointless and extremely bloody fighting, and eventually the U.S. would get involved, before the war ended in a stalemate which guaranteed another bloody conflict 20 years later. IMO, this makes that night of peace seem pretty pointless. But a century later it's still idealized.