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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section IV : On the rights and duties of the belligerent with regard to enemy property - Art. 31.
Art. 31. A. Ships and cargoes -- War-ships. The armed forces of a State may attack the enemy's war-ships, to take possession of them or to destroy them, together with their equipment and supplies, whether these ships, at the beginning of the struggle, are in a harbour of the State, or are encountered at sea, in ignorance of hostilities; or by ' force majeure ' are either compelled to enter a port, or are cast on the shores of said State.