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Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter II : Contraband of war - Art. 31.
Art. 31. Proof of the destination specified in Article 30
is complete in the following cases:
(1) When the goods are documented for discharge in an enemy port, or for delivery to the armed forces of the enemy.
(2) When the vessel is to call at enemy ports only, or when she is to touch at a enemy port or meet the armed forces of the enemy before reaching the neutral port for which the goods in question are documented.