Well done Red Cross! Prisoner of War Records can now be searched. When I have learned what can be found, more posts should follow. Here’s a record relating to a recent Guestbook visitor:-
ICRC Record Charles Selby.
CWGC Concentration record showing original burial of Charles Selby
The records cover Prisoners of War, but also German citizens interned during hostilities. These included my gt gt Uncle Ernst Wissel who was married to Aunt Lily and provided a roof over my Grandad’s head in 1911
Ernst Wissel Internment Record
17th Battalion Manchester Regiment on the Somme 
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