1914 - Just after midnight on Christmas morning, German troops cease firing their guns and artillery and start singing Christmas carols. Crossing the No man's land, they trade gifts with the enemy forces that face them. The truce lasts for three days.
1 BC (observed): birth of Jesus Christ, considered to be the Son of God (by Christians); also considered an ascetic prophet of Islam. The date of Christ's birth is celebrated on several different days, worldwide.