On Christmas Eve 1914, in the dank, muddy trenches on the Western Front of the first world war, a remarkable thing happened.It came to be called the Christmas Truce. And it remains one of the most storied and strangest moments of the Great War—or of any war in history.(snip)What happened next would, in the years to come, stun the world and make history. Enemy soldiers began to climb nervously out of their trenches, and to meet in the barbed-wire-filled “No Man’s Land” that separated the armies. Normally, the British and Germans communicated across No Man’s Land with streaking bullets, with...