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Convention (XI) relative to certain Restrictions with regard to the Exercise of the Right of Capture in Naval War. The Hague, 18 October 1907.
Chapter III : Regulations regarding the crews of enemy merchant ships captured by a belligerent - Art. 6.
Art. 6. The captain, officers, and members of the crew, when nationals of the enemy State, are not made prisoners of war, on condition that they make a formal promise in writing, not to undertake, while hostilities last, any service connected with the operations of the war.