Friday 1 July marks the 100th anniversary of the beginning of the Battle of the Somme, one of the bloodiest battles in history.
Over the course of four months, almost a million men on both sides lost their lives, with 19,240 dying in the first day alone.
Many people will be familiar with the many black and white images of men huddled in the trenches, exposed to the elements and covered in mud.
But a poignant set of images newly-colourised by Tom Marshall at PhotograFix shows what life was like in the trenches even more vividly.
Soldiers can be seen posing next to guns and peering out from tents, injured prisoners being escorted and tactics discussed.
The UK will fall silent for two minutes to mark the centenary on Friday.
The Queen and other senior royals will lead commemorations at Westminster Abbey.
According to the Independent, the Duke and Duchess of Cambridge and Prince Harry will attend evening events at the Thiepval Memorial in France.
They will be joined by the Prince of Wales and Duchess of Cornwall and 10,000 members of the British public.