Add to ORKGThis is a photograph of the original letter, written in French; when exposed to certain chemicals, a secret message appeared. The Germans discovered the letter and were able to expose the secret message.https://scholarworks.wmich.edu/wwi_pow_camps/1331/thumbnail.jp
This photograph depicts instruments which prisoners could use in escape attempts from German prisons...
Front: Tan paper, folded in half. One side has the addressee written on black dotted line in pencil....
French and Belgian prisoners route letters to their comrades in the prison post office at Grafenwoeh...
Translation into German of the secret message found in a French prisoner\u27s mail. The Allies used...
German censors in prison camps always had to remain vigilant regarding the passage of secret message...
The Allies used these groups of letters as the basis for their secret correspondence with a French p...
German censors found sabotage material in a rubber balloon found inside a can of marmelade preservat...
German censors at Puccheim intercepted this package containing bacteria for germ warfare against cat...
A French prisoner is busy writing a letter from Muensingen in this drawing. POW\u27s were allowed t...
Ralph enclosed a picture after they captured the Germans in the Falaise Pockethttps://nwcommons.nwci...
British and French prisoners unpack newly arrived letters and parcels from home in the mail censorsh...
German officers and interpreters open and review recently arrived mail searching for contraband and ...
This Prisoner of war letter is written in German.https://scholarsjunction.msstate.edu/postal-history...
Example of a letter from a British prisoner at Muenster, written on 16 December 1917. It is written...
Front: Red printed message on top in German, titled: Konzentrationslager Sachsenhausen. On the sid...
This photograph depicts instruments which prisoners could use in escape attempts from German prisons...
Front: Tan paper, folded in half. One side has the addressee written on black dotted line in pencil....
French and Belgian prisoners route letters to their comrades in the prison post office at Grafenwoeh...
Translation into German of the secret message found in a French prisoner\u27s mail. The Allies used...
German censors in prison camps always had to remain vigilant regarding the passage of secret message...
The Allies used these groups of letters as the basis for their secret correspondence with a French p...
German censors found sabotage material in a rubber balloon found inside a can of marmelade preservat...
German censors at Puccheim intercepted this package containing bacteria for germ warfare against cat...
A French prisoner is busy writing a letter from Muensingen in this drawing. POW\u27s were allowed t...
Ralph enclosed a picture after they captured the Germans in the Falaise Pockethttps://nwcommons.nwci...
British and French prisoners unpack newly arrived letters and parcels from home in the mail censorsh...
German officers and interpreters open and review recently arrived mail searching for contraband and ...
This Prisoner of war letter is written in German.https://scholarsjunction.msstate.edu/postal-history...
Example of a letter from a British prisoner at Muenster, written on 16 December 1917. It is written...
Front: Red printed message on top in German, titled: Konzentrationslager Sachsenhausen. On the sid...
This photograph depicts instruments which prisoners could use in escape attempts from German prisons...
Front: Tan paper, folded in half. One side has the addressee written on black dotted line in pencil....
French and Belgian prisoners route letters to their comrades in the prison post office at Grafenwoeh...