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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. 49.
Art. 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.
All soldiers, of whatever species of arms; all men who belong to the rising en masse of the hostile country; all those who are attached to the army for its efficiency and promote directly the object of the war, except such as are hereinafter provided for; all disabled men or officers on the field or elsewhere, if captured; all enemies who have thrown away their arms and ask for quarter, are prisoners of war, and as such exposed to the inconveniences as well as entitled to the privileges of a prisoner of war.