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Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter III : Unneutral service - Art. 45.
Art. 45. A neutral vessel will be condemned and will, in a general way, receive the same treatment as a neutral vessel liable to condemnation for carriage of contraband:
(1) If she is on a voyage especially undertaken with a view to the transport of individual passengers who are embodied in the armed forces of the enemy, or with a view to the transmission of intelligence in the interest of the enemy.
(2) If, to the knowledge of either the owner, the charterer, or the master, she is transporting a military detachment of the enemy, or one or more persons who, in the course of the voyage, directly assist the operations of the enemy.
In the cases specified under the above heads, goods belonging to the owner of the vessel are likewise liable to condemnation.
The provisions of the present Article do not apply if the vessel is encountered at sea while unaware of the outbreak of hostilities, or if the master, after becoming aware of the outbreak of hostilities, has had no opportunity of disembarking the passengers. The vessel is deemed to be aware of the existence of a state of war if she left an enemy port subsequently to the outbreak of hostilities, or a neutral port subsequently to the notification of the outbreak of hostilities to the Power to which such port belongs, provided that such notification was made in sufficient time.