The Duke and Duchess of Cambridge with Prince Harry at a twilight vigil remembering those killed and wounded at the Battle of the Somme
(photo Kensington Royal Twitter)
It was the biggest battle of World War One, lasting for five months and leaving over a million dead or wounded. As the world prepares to mark the centenary of the Battle of the Somme, the Royal Family has attended services in London and in France to mark the eve of the anniversary.