At least one account has survived of a Christmas Truce gone bad: the story of Private Percy Huggins, a Briton who was relaxing in No Man’s Land with the enemy when a sniper shot to the head killed him and set off more bloodshed. The sergeant who took Huggins’ place, hoping to avenge his death, was then himself picked off and killed.

In another account, a German scolded his fellow soldiers during the Christmas Truce: “Such a thing should not happen in wartime. Have you no German sense of honor left?” That 25-year old soldier’s name was Adolf Hitler.

Neither was high command pleased with the festivities. On Dec. 7, 1914, Pope Benedict had implored leaders of the battling nations to hold a Christmas truce, asking "that the guns may fall silent at least upon the night the angels sang." The plea was officially ignored.