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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. 65.
Art. 65. D. Parlementaires. The personnel of cartel ships is inviolable.
It loses its rights of inviolability if it is proved in a clear and incontestable manner that it has taken advantage of its privileged position to provoke or commit an act of treason.