Treaties, States Parties and Commentaries
Treaties and Documents
Geneva Conventions of 1949 and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Instructions for the Government of Armies of the United States in the Field (Lieber Code). 24 April 1863.
Section V : Safe-conduct -- Spies -- War-traitors -- Captured messengers -- Abuse of the flag of truce - Art. 89.
Art. 89. If a citizen of the United States obtains information in a legitimate manner, and betrays it to the enemy, be he a military or civil officer, or a private citizen, he shall suffer death.