I went to Verdun a few years ago. If you do go there is an amazing cemetery there https://en.wikipedia.org/wiki/Douaumont_Ossuary
It is the largest single French military cemetery of the First World War with 16,142 graves. But there is something even more unbelievable; it wasn't clearly marked...
The Union Flag that Railton used as an altar cloth at the front and was used to drape over the coffin of the Unknown Soldier before the burial still flies in Westminster Abbey today