Christmas in the Trenches

As soon as they were finished and a reverent pause was spent
"God Rest Ye Merry Gentlemen" struck up some lads from Kent
The next they sang was "Stille Nacht," "Tis 'Silent Night'," says I
And in two tongues one song filled up that sky.
"There's someone coming towards us!" the front line sentry cried
All sights were fixed on one lone figure coming from their side
His truce flag, like a Christmas star, shone on that plain so bright
As he bravely strode unarmed into the night.

Lyrics by John McCutcheon to a song I've never heard, about events described here.