This is mostly a myth:
That said, while some fraternization did occur between British and German troops on December 25, 1914, evidence for it is highly anecdotal. Moreover, the French were in no mood to drink and be merry with the Germans, who were occupying a good chunk of French soil, not to mention that in the five months leading up to Christmas, 300,000 French soldiers died trying to keep even more of their country from falling into German hands. Fraternization incidents between French and Germans were very much the exception that first war Christmas.
Despite this, European footballers have commemorated the Christmas Truce in their own way, while the British and German military have even held a centenary football match to celebrate the much-mythologized event. The Christmas Truce has always been a particularly British affectation, the football match being an indication of the fair-play and good-sporting values of the British generation that waged — and, as few seem to remember, won — the Great War. In a similar fashion, the 36th (Ulster) Division went “over the top” on the first day of the great Somme offensive, July 1, 1916, led by a football kicked out by a lead battalion, only to be mowed down, counting among the 57,000 British troops who fell dead or wounded that terrible day.
The Christmas Truce idea is beloved by many, beyond football fans, for its hint that, beneath the horror, British and Germans were just ordinary men cast into the maelstrom of unprecedented bloodshed. From there it’s easy to reach notions that, but for nasty generals, all might have ended with “average men” coming together to end the madness. In the background, a very furry John and Yoko are encouraging “Hair Peace, Bed Peace.” The appeal of this, a hundred years on, when Britain and Germany are together in the European Union, is humane and understandable. However, we must not get carried away by the power of pleasant myth-making.
https://20committee.com/2014/12/24/the-1914-christmas-truce/
Well, my Dad was in WW2 & Korea & died in Vietnam. And he HATED war. He only spoke of war a couple of times before leaving for Vietnam, and then only a few sentences. One was, "You're tired; you're dirty; you're hungry. But you have a job to do and you do it." Then he got up and left the room.
Maybe it was different in WW1...or not!
That doesn't have credibility, looks like the author is from the "Lies of History" school of propaganda. Anecdotal? Yeah, so is courtroom testimony. The event was clearly and consistently described in anecdotes by participants who survived long anough to tell people about it. It happened early in the War, just months after its start, and was attested by British and Germans.