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Convention on Maritime Neutrality. Havana, 20 February 1928.
Section I : Freedom of commerce in time of war - Art. 1.
Article 1. The following rules shall govern commerce of war:
(1) Warships of the belligerents have the right to stop and visit on the high seas and in territorial waters that are not neutral any merchant ship with the object of ascertaining its character and nationality and of verifying whether it conveys cargo prohibited by international law or has committed any violation of blockade. If the merchant ship does not heed the signal to stop, it may be pursued by the warship and stopped by force; outside of such a case the ship cannot be attacked unless, after being hailed, it fails to observe the instructions given it.
The ship shall not be rendered incapable of navigation before the crew and passengers have been placed in safety.
(2) Belligerent submarines are subject to the foregoing rules. If the submarine cannot capture the ship while observing these rules, it shall not have the right to continue to attack or to destroy the ship.