History for ready reference, Volume 6
CHAPTER II.
On Spies.
ARTICLE XXIX. An individual can only be considered a spy if, acting clandestinely, or on false pretences, he obtains, or seeks to obtain information in the zone of operations of a belligerent, with the intention of communicating it to the hostile party. Thus, soldiers not in disguise who have penetrated into the zone of operations of a hostile army to obtain information are not considered spies. Similarly, the following are not considered spies: soldiers or civilians, carrying out their mission openly, charged with the delivery of despatches destined either for their own army or for that of the enemy. To this class belong likewise individuals sent in balloons to deliver despatches, and generally to maintain communication between the various parts of an army or a territory.
ARTICLE XXX. A spy taken in the act cannot be punished without previous trial.
ARTICLE XXXI. 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.