Queen Elizabeth used her traditional Christmas broadcast to call for international reconciliation and praise medical workers fighting Ebola in Africa.

She said it will take time to heal divisions in Scotland, where a referendum was held this year on whether to remain part of Britain, and praised progress resolving the conflict in Northern Ireland. Elizabeth cited the “Christmas truce” in 1914 as an example to be remembered.

“Something remarkable did happen that Christmas, exactly 100 years ago today,” she said. “Without any instruction or command, the shooting stopped and German and British soldiers met in No Man’s Land. Photographs were taken and gifts exchanged. It was a Christmas truce.”

She said German forces sang Silent Night so that it could be heard on the British side of the front line.

“That carol is still much-loved today, a legacy of the Christmas truce, and a reminder to us all that even in the unlikeliest of places hope can still be found,” the Queen said before wishing everyone a happy Christmas.

The Queen and her close family celebrated Christmas at the sprawling Sandringham estate in Norfolk.