Merry Christmas, gentlemen.
Official caption: “British and German officers meeting in No-Man’s Land during the unofficial ‘Christmas truce,’ Dec. 25, 1914. British troops from the Northumberland Yeomanry (Hussars), 7th Division, Bridoux-Rouge Banc Sector.”
Photo by (Hon.) Harold Burge Robson, IWM Q 50721
Same details, Q 50719 http://www.iwm.org.uk/collections/item/object/205022262
A fairly decent doc on the encounter, below.