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Instructions for the Government of Armies of the United States in the Field (Lieber Code). 24 April 1863.
Section III : Deserters -- Prisoners of war -- Hostages -- Booty on the battle-field. - Art. 65.
Art. 65. The use of the enemy's national standard, flag, or other emblem of nationality, for the purpose of deceiving the enemy in battle, is an act of perfidy by which they lose all claim to the protection of the laws of war.