Treaties, States Parties and Commentaries
Treaties and Documents
Geneva Conventions of 1949 and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter I : Blockade in time of war - Art. 9.
Art. 9. A declaration of blockade is made either by the blockading Power or by the naval authorities acting in its name.
It specifies --
(1) The date when the blockade begins;
(2) the geographical limits of the coastline under blockade;
(3) the period within which neutral vessels may come out.