A couple versions of 'Christmas In The Trenches' by John McCutcheon, a reading from a service on Ben W's site, a nice write-up from TSK, and God's Politics. It all deals with the Christmas Eve truce of 1914 (ww1).
Christmas in the trenches - with story intro.
Christmas in the trenches - with recent war photos.
A reading of it (via BW3).
Andrew Jones' 'The Most Famous Christmas Eve.'
God's Politics article.