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. 90.
Art. 90. A traitor under the law of war, or a war-traitor, is a person in a place or district under Martial Law who, unauthorized by the military commander, gives information of any kind to the enemy, or holds intercourse with him.