The following is a direct quote about Joyeux Noel from Kenneth Chisholm (firstname.lastname@example.org):
In 1914, World War I, the bloodiest war ever at that time in human history, was well under way. However on Christmas Eve, numerous sections of the Western Front called an informal, and unauthorized, truce where the various front-line soldiers of the conflict peacefully met each other in No Man's Land to share a precious pause in the carnage with a fleeting brotherhood. This film dramatizes one such section as the French, Scottish and German sides partake in the unique event, even though they are aware that their superiors will not tolerate its occurrence.
This movie depicts French, German, and Scottish soldiers on the front declaring a cease-fire through Christmas. Rather than a simplistic feel-good story, this film successfully explores various experiences on the front in 1914, including mixed emotions of those who were grieving the dead, those in command, and the various responses and repercussions of recognizing the humanity in the enemy.