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Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter I : Blockade in time of war - Art. 10.
Art 10. If the operations of the blockading Power, or of the naval authorities acting in its name, do not tally with the particulars, which, in accordance with Article 9(1) and (2)
, must be inserted in the declaration of blockade, the declaration is void, and a new declaration is necessary in order to make the blockade operative.