49. A prisoner of war is a public enemy, armed or attached to the hostile army for active aid, who has fallen into the hands of the captor, either fighting or wounded, on the field or in the hospital, by individual surrender or by capitulation. 52. No belligerent has the right to declare that he will treat every captured man in arms, of a levy en masse, as a brigand or bandit. * * * 56. A prisoner of war is subject to no punishment for being a public enemy, nor is any revenge wreaked upon him by the intentional infliction of any suffering, or disgrace by cruel imprisonment, want of food, by mutilation, death, or any other barbarity. 57. So soon as a man is armed by a sovereign government, and takes the soldier's oath of fidelity, he is a belligerent; his killing, wounding, or other warlike acts are no individual crime or offence. * * * 67. The law of nations allows every sovereign government to make war upon another sovereign state, and therefore admits of no rules or laws different from those of regular warfare regarding the treatment of prisoners of war, although they may belong to the army of a government which the captor may consider as a wanton and unjust assailant. The use of poison in any manner, be it to poison wells, or food, or arms, is wholly excluded from modern warfare. He that uses it puts himself out of the pale of the laws and usages of war. 71. Whoever intentionally inflicts additional wounds on an enemy already wholly disabled, or kills such an enemy, or who orders or encourages soldiers to do so, shall suffer death if duly convicted, whether he belongs to the army of the United States, or is an enemy captured after having committed his misdeed. 72. Money and other valuables on the person of a prisoner, such as watches or jewelry, as well as extra clothing, are regarded by the American army as the private property of the prisoners, and the appropriation of such valuables or money is considered dishonorable, and is prohibited. 74. A prisoner of war, being a public enemy, is the prisoner of the government and not of the captor. No ransom can be paid by a prisoner of war to his individual captor or to any officer in command. The government alone releases captives, according to rules prescribed by itself. 75. Prisoners of war are subject to confinement or imprisonment, such as may be deemed necessary on account of safety, but they are to be subjected to no other intentional suffering or indignity. The confinement and mode of treating a prisoner may be varied during his captivity, according to the demands of safety. 76. Prisoners of war shall be fed upon plain and wholesome food whenever practicable, and treated with humanity. They may be required to work for the benefit of the captor's government, according to their rank and condition.