Work has begun to excavate mass graves in Fromelles northern France. The bodies of at least 400 British and Australian soldiers are expected to be uncovered.
Authorities have asked relatives of the known missing for DNA samples, in the hopes that the majority of those interred will be identified.
The bodies to be recovered are to be re interred in a new military cemetery. The Commonwealth War Graves Commission, says this is the first new WWI military cemetery in over 50 years.
You can read all about this fascinating work on the BBC News site.