During the First World War, enemy soldiers exchanged gifts and played football on Christmas 1914.
Why it is true
In December 1914, along the Western Front, British and German soldiers left their trenches, exchanged cigarettes and food and played football in no man's land. The truce was unofficial and did not last more than a few days.
Source: Imperial War Museum
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.