Final provisions - Art. 66.
Art. 66. The Signatory Powers undertake to insure the mutual observance of the rules contained in the present Declaration in any war in which all the belligerents are parties thereto. They will therefore issue the necessary instructions to their authorities and to their armed forces, and will take such measures as may be required in order to insure that it will be applied by their courts, and more particularly by their prize courts.