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. 6.
Art. 6. The commander of a blockading force may give permission to a warship to enter, and subsequently to leave, a blockaded port.