The wills of 230,000 British Empire soldiers written in their own hand have been placed on a new website allowing families and historians to view them for the first time.
About 5% of the wills contain a treasure trove of personal letters penned by the soldiers and intended for loved ones back home, but which were never posted.
Instead, those letters have lain alongside the writers' wills in row upon row of sealed archive boxes for 100 years, until now.
In one such letter, written on August 10, 1914, Pte Joseph Witchburn of 2nd Battalion The Durham Light Infantry tells his mother: "I dare say this will be the last letter you will receive from me until the war is over, as I am prepared to move to the front at any moment."
A Government official recorded on his will that he died of his wounds on September 14, 1914.
Another will belonging to John Fleetwood, grand-father of rock band Fleetwood Mac's Mick Fleetwood, reveals his death from dysentery in a hospital in Malta on December 30, 1915, after serving in Gallipoli.