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.

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.

Art. 11. A declaration of blockade is notified: (1) to neutral powers,
by the blockading power by means of a communication addressed to the
governments direct, or to their representatives accredited to it; (2)
to the local authorities, by the officer commanding the blockading
force. The local authorities will, in turn, inform the foreign
consular officers at the port or on the coastline under blockade as
soon as possible.

Art. 12. The rules as to declaration and notification of blockade
apply to cases where the limits of a blockade are extended, or where a
blockade is re-established after having been raised.

Art. 13. The voluntary raising of a blockade, as also any restriction
in the limits of a blockade, must be notified in the manner prescribed
by Article 11.

Art. 14. The liability of a neutral vessel to capture for breach of
blockade is contingent on her knowledge, actual or presumptive, of the
blockade.

Art. 15. Failing proof to the contrary, knowledge of the blockade is
presumed if the vessel left a neutral port subsequently to the
notification of the blockade to the power to which such port belongs,
provided that such notification was made in sufficient time.

Art. 16. If a vessel approaching a blockaded port has no knowledge,
actual or presumptive, of the blockade, the notification must be made
to the vessel itself by an officer of one of the ships of the
blockading force. This notification should be entered in the vessel's
logbook, and must state the day and hour, and the geographical
position of the vessel at the time. If through the negligence of the
officer commanding the blockading force no declaration of blockade has
been notified to the local authorities, or if in the declaration, as
notified, no period has been mentioned within which neutral vessels
may come out, a neutral vessel coming out of the blockaded port must
be allowed to pass f