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Instructions for the Government of Armies of the United States in the Field (Lieber Code). 24 April 1863.
Section VI : Exchange of prisoners -- Flags of truce -- Flags of protection - Art. 107.
Art. 107. A prisoner of war is in honor bound truly to state to the captor his rank; and he is not to assume a lower rank than belongs to him, in order to cause a more advantageous exchange, nor a higher rank, for the purpose of obtaining better treatment.
Offenses to the contrary have been justly punished by the commanders of released prisoners, and may be good cause for refusing to release such prisoners.