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Convention (IX) concerning Bombardment by Naval Forces in Time of War. The Hague, 18 October 1907.
Chapter II : General provisions - Art. 5.
Art. 5. In bombardments by naval forces all the necessary measures must be taken by the commander to spare as far as possible sacred edifices, buildings used for artistic, scientific, or charitable purposes, historic monuments, hospitals, and places where the sick or wounded are collected, on the understanding that they are not used at the same time for military purposes.
It is the duty of the inhabitants to indicate such monuments, edifices, or places by visible signs, which shall consist of large, stiff rectangular panels divided diagonally into two coloured triangular portions, the upper portion black, the lower portion white.