Black and white images of a conflict that happened nearly a century ago remain powerful reminders of the horrors of war.
Here - against a backdrop of some of the most vivid photographs from the time - historians and people who lived through World War I recall the lead-up to the 1918 Armistice.
Warning: contains graphic images.
There are no captions with this slideshow.
Production by Paul Kerley.
Commentators: John Bourne, Professor Gary Sheffield, Professor Hew Strachan.
Includes BBC radio archive and excerpts from the 1964 BBC television series 'The Great War'.
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