I have found a site which has helped me to track down details of my Great Uncle who died at the battle of the Marne in July 1918. It seems he has no grave but is remembered on a beautiful memorial in Aisne.
Looking through the site, I found it touching that families who then lived very close to my home, to my left and to my right, lost their sons.
This may be of interest www.astreetnearyou.org .
Passports not in the drawer I always keep them in. Turning the place upside down.