Volunteers have so far mapped 5,000 square metres of land used by soldiers training for battle in the First World War.
Trenches had been dug in the area being charted, part of Berkhamsted Common, and they are now being restored as part of the Chilterns Commons Project.
They had become overgrown with shrubs including hawthorn trees, which are being cleared at the moment, restoring great views of the valley.
Project co-ordinator Norman Groves, 64, said: “This is a memorial project to the 2,200 people who died after being trained in Berkhamsted.
“That’s the key thing, as we come up to the 100th anniversary of World War One.”
The mapping process is now a third complete and is expected to be finished by March or April next year.