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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. 150.
Art. 150. Civil war is war between two or more portions of a country or state, each contending for the mastery of the whole, and each claiming to be the legitimate government. The term is also sometimes applied to war of rebellion, when the rebellious provinces or portions of the state are contiguous to those containing the seat of government.