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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section II : On the armed force of belligerent states - Art. 2.
Art. 2. War-ships. Constituting part of the armed force of a belligerent State and, therefore, subject as such to the laws of naval warfare are:
(1) All ships belonging to the State which, under the direction of a military commander and manned by a military crew, carry legally the ensign and the pendant of the national navy.
(2) Ships converted by the State into war-ships in conformity with Articles 36