If you think this footage is cheesy then you should actually know how cheesy reality was:

The Christmas truce was a series of widespread unofficial ceasefires that took place along the Western Front around Christmas of 1914, during the First World War.The Germans began by placing candles on their trenches and on Christmas trees, then continued the celebration by singing Christmas carols. The British responded by singing carols of their own. The two sides continued by shouting Christmas greetings to each other. Soon thereafter, there were excursions across the 'No Man's Land', where small gifts were exchanged, such as food, tobacco and alcohol, and souvenirs such as buttons and hats. As well as joint burial ceremonies, several meetings ended in carol-singing, or – famously – games of football.

The artillery in the region fell silent that night. The truce also allowed a breathing spell where recently-fallen soldiers could be brought back behind their lines by burial parties. Joint services were held.