ICRC databases on international humanitarian law
Treaties and Documents
1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Convention (IV) respecting the Laws and Customs of War on Land and its annex: Regulations concerning the Laws and Customs of War on Land. The Hague, 18 October 1907.
Annex to the Convention: Regulations respecting the laws and customs of war on land - Section II : Hostilities - Chapter II : Spies - Regulations: Art. 31.
Art. 31. A spy who, after rejoining the army to which he belongs, is subsequently captured by the enemy, is treated as a prisoner of war, and incurs no responsibility for his previous acts of espionage.