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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. 61.
Art. 61. Members of the personnel of a public or of a private vessel, who are personally guilty of an act of hostility towards the enemy, may be held by him as prisoners of war, without prejudice to the penalties he might otherwise incur.