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 (traditionally): birth of Jesus Christ, held to be the Son of God in Christian belief, considered a prophet and wise man in Islamic belief. The actual date of Christ's birth is a subject of dispute and is celebrated on several different days worldwide.