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Instructions for the Government of Armies of the United States in the Field (Lieber Code). 24 April 1863.
Section X : Insurrection -- Civil war -- Rebellion - Art. 149.
Art. 149. Insurrection is the rising of people in arms against their government, or a portion of it, or against one or more of its laws, or against an officer or officers of the government. It may be confined to mere armed resistance, or it may have greater ends in view.