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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. 55.
Art. 55. A. Personnel of vessels -- War-ships. When a war-ship is captured by the enemy, combatants and non-combatants forming part of the armed forces of the belligerents, arc to be treated as prisoners of war.