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This occurred in the "Christmas Truce" in 1914.
During war, there is no time for deployed soldiers to take off. However, on the Western Front there was the 1914 Christmas Truce where both sides agreed to a ceasefire on Christmas day.
A ceasefire is a temporary stop to a war when both sides agree to suspend fighting. It is a signal or an order to stop fighting.
The result of the ceasefire was no shooting, just that, and it still exists uneasily today. No peace treaty was ever signed.
I believe that on a famous occasion an informal truce was declared on Christmas day during which British and German troops had a 'kickabout' with a football in no mans land between the trenches. This did not happen again as the higher echelons on both sides considered such behavior to be detrimental to their war effort. No Christmas cheer there.
I heard the Bells on Christmas Day, which has a strong anti-war element, it was written during the US Civil War by Longfellow. as far as is known this was the only Christmas song ever done by the famous poet, who had a long white beard and more than a little resembled St. Nick!
The North conquered the South. Negotiations? Ceasefire? Not quite; the South surrendered!
There was no Remembrance day in 1916. Remembrance day came about after the war ended. It is honoured on Nov 11, not Christmas Day.
There used to be Christmas "Cease-Fires" during the Vietnam War.
No technically the war isn't over. In 1994 there was a ceasefire but never an official treaty. The war technically continues till this day because Azerbaijan is using force on the territory killing Armenians and threatening another war.
See website: Korean War
There was an unofficial truce which included an unofficial ceasefire funerals (some featuring German and English prayers) and a football match now known as 'the war game'