Treaties, States Parties and Commentaries
Treaties and Documents
Geneva Conventions of 1949 and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Project of an International Declaration concerning the Laws and Customs of War. Brussels, 27 August 1874.
Spies - Art. 21.
Art. 21. A spy who rejoins the army to which he belongs and who is subsequently captured by the enemy is treated as a prisoner of war and incurs no responsibility for his previous acts.