Starting on Christmas Eve, many German and British troops fighting in World War I sang Christmas carols to each other across the lines, and at certain points the Allied soldiers even heard brass bands joining the Germans in their joyous singing.

At the first light of dawn on Christmas Day, some German soldiers emerged from their trenches and approached the Allied lines across no-man’s-land, calling out “Merry Christmas” in their enemies’ native tongues. At first, the Allied soldiers feared it was a trick, but seeing the Germans unarmed they climbed out of their trenches and shook hands with the enemy soldiers. The men exchanged presents of cigarettes and plum puddings and sang carols and songs. Some Germans lit Christmas trees around their trenches, and there was even a documented case of soldiers from opposing sides playing a good-natured game of soccer.