ICRC databases on international humanitarian law
Treaties, States Parties and Commentaries
Treaties and Documents
Geneva Conventions of 1949 and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter VI : Enemy character - Art. 57.
Art. 57. Subject to the provisions respecting transfer to another flag, the neutral or enemy character of a vessel is determined by the flag which she is entitled to fly.
The case where a neutral vessel is engaged in a trade which is closed in time of peace, remains outside the scope of, and is in no wise affected by, this rule.