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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section V : On the rights and duties of the belligerent with regard to individuals - Art. 68.
Art. 68. The spy who succeeds in escaping from the zone corresponding to the enemy's actual sphere of operations, or who has rejoined the armed force to which he belongs, if he later falls into the power of the enemy, incurs no responsibility for his previous acts.