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Convention (VI) relating to the Status of Enemy Merchant Ships at the Outbreak of Hostilities. The Hague, 18 October 1907.
Article 1. When a merchant ship belonging to one of the belligerent Powers is at the commencement of hostilities in an enemy port, it is desirable that it should be allowed to depart freely, either immediately, or after a reasonable number of days of grace, and to proceed, after being furnished with a pass, direct to its port of destination or any other port indicated.
The same rule should apply in the case of a ship which has left its last port of departure before the commencement of the war and entered a port belonging to the enemy while still ignorant that hostilities had broken out.