Christmas Day, 1914 is celebrated every year as a testimony to many things. You will see inspiring posts about it on social media, and you will be moved, as I am every year. Christians like to think that on this day, the Prince of Peace conquered, because on this day, at several points along the Western Front, British and French troops on one side and German troops on the other, stopped shooting at each other, came out of the trenches and shared food, soccer, cigarettes and the "Christmas spirit." And the war was over! No. They went back to killing each other. It almost makes me want to become a Puritan, because in banning the celebration of Christmas (and other holy-days, since no day was really more holy than any other, they reasoned), the Puritans might have avoided this particular hypocrisy. But maybe we should celebrate it. When one's home is the battlefield, a day of fellowship between enemy soldiers is really incredible. When your world is relatively stable and tranquil (like many Americans, as long as they avoid cable-news), an act of violence on Christmas seems the worst of atrocities. So, I'm posting this early; you might forget about it by the 25th...

Forget about it by the 25th so you can enjoy a nice Christmas with your family, but read on for now. Another Christmas event that Americans like to celebrate is Washington crossing the Delaware on Christmas Day 1776. David Hackett Fischer wrote a great big book about it that is quite acclaimed. Did you remember that it was a Christmas event? There's a great (if inaccurate) painting of it that you might have seen. Below is a partial view from pbs.org.
Why did Washington cross the Delaware on Christmas? It sounds like the beginning of a joke. It is not.

 In Joseph Buffington's 1936 biography, The Soul of Washington, Buffington praised Washington’s wisdom in making the “Christmas Day” (actually December 26, 1776) attack on Trenton, NJ.  Buffington wrote that Washington devised the attack because he was “filled with the Christmas spirit himself… [and] knowing the German and British love of Christmas and their joy of Christmas cheer… [they] would, of all nights in the year, be off guard (53f).” Perhaps Washington (the schismatic Anglican?) was strangely Puritan about holidays? Not likely. Buffington went to great lengths to establish Washington’s special love of Christmas. He might overplay Washington’s “Christmas spirit” but surely the General was capitalizing on the British and German celebrations. Reportedly, when Washington was informed by General Sullivan that the weather inhibited the army’s weapons from firing, Washington retorted “Tell General Sullivan to use the bayonet. I am resolved to take Trenton."[i] Apparently the British/German forces suffered 'only' 23-26 casualties to the Americans 4 or 5. Still, this is not what most Americans think of as “the Christmas spirit” in either the religious or secular sense. In 1779, publisher John Bell wrote that Washington was “a total stranger to religious prejudices, which have so often excited Christians of one denomination to cut the throats of those of another.”[ii] And yet, when caught up in a political conflict against other Christians it was, “use the bayonet.” I know some of my fellow American-Christians are equally inspired by this event and by the Christmas Day truce of 1914, but I that is too much cognitive dissonance for me. For me, December 25, 1776 remains the “Real” War on Christmas. With this kind of historical example, I can’t be too irate over “Happy Holidays.” Now, forget about this and enjoy the Holidays. I intend to have a joyous celebration of the birth of Jesus Christ (that’s basically what ‘Merry Christmas’ means right?).

References:
Howard Peckham, ed.  The Toll of Independence: Engagements and Battle Casualties of the American Revolution (Chicago: The University of Chicago Press, 1974), 27.
[i] Wright, Kevin. “The Crossing and Battle at Trenton – 1776” An article for Bergen County Historical Society. http://www.bergencountyhistory.org/Pages/crossingatdtrenton.html
[ii] Boller, George Washington and Religion, 118.