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Convention (IX) concerning Bombardment by Naval Forces in Time of War. The Hague, 18 October 1907.
Chapter I : The bombardment of undefended ports, towns, villages, dwellings, or buildings - Art. 1.
Article 1. The bombardment by naval forces of undefended ports, towns, villages, dwellings, or buildings is forbidden.
A place cannot be bombarded solely because automatic submarine contact mines are anchored off the harbour.