On Christmas Eve 1914, during World War I, British and German soldiers stopped fighting. Many of them left their trenches and started to talk and exchange gifts. But after a few hours of peace they were ordered back to their guns.
The Christmas truce was a series of widespread, unofficial ceasefires that took place along the Western Front around Christmas 1914, during World War I. Through the week leading up to Christmas, parties of German and British soldiers began to exchange seasonal greetings and songs between their trenches; on occasion, the tension was reduced to the point that individuals would walk across to talk to their opposite numbers bearing gifts. On Christmas Eve and Christmas Day, many soldiers from both sides -- as well as, to a lesser degree, from French units -- independently ventured into "no man's land", where they mingled, exchanging food and souvenirs. As well as joint burial ceremonies, several meetings ended in carol-singing. Troops from both sides were also friendly enough to play games of football with one another.
The truce is seen as a symbolic moment of peace and humanity amidst one of the most violent events of modern history. It was not ubiquitous; in some regions of the front, fighting continued throughout the day, while in others, little more than an arrangement to recover bodies was made. The following year, a few units again arranged ceasefires with their opponents over Christmas, but the truces were not nearly as widespread as in 1914; this was, in part, due to strongly worded orders from the high commands of both sides prohibiting such fraternisation. In 1916, after the unprecedentedly bloody battles of the Somme and Verdun, and the beginning of widespread poison gas use, soldiers on both sides increasingly viewed the other side as less than human, and no more Christmas truces were sought.
In the early months of immobile trench warfare, the truces were not unique to the Christmas period, and reflected a growing mood of "live and let live", where infantry units in close proximity to each other would stop overtly aggressive behaviour, and often engage in small-scale fraternisation, engaging in conversation or bartering for cigarettes. In some sectors, there would be occasional ceasefires to allow soldiers to go between the lines and recover wounded or dead comrades, while in others, there would be a tacit agreement not to shoot while men rested, exercised, or worked in full view of the enemy. The Christmas truces were particularly significant due to the number of men involved and the level of their participation -- even in very peaceful sectors, dozens of men openly congregating in daylight was remarkable.