For the Union army's prosecution of the American Civil War, General Order No. 100 (April 24, 1863) concerns the practical particulars of
martial law, military
jurisdiction, and the treatment of Confederate
irregular fighters, such as spies,
deserters, and prisoners of war. In the field practice of military justice, the unit commander held authority for any prosecution under the Lieber Code, which command authority included the
summary execution of Confederate prisoners of war and war-criminal soldiers of the Union army. In the context of the American Civil War, the Lieber Code explains the concepts of
military necessity and
humanitarian needs in articles 14, 15, and 16 of Section I: In the late 19th century, the Lieber Code was the first modern codification of both
customary international law and the
law of war of Europe, and later was a basis for the
Hague Convention of 1907, which restated and codified the practical particulars of that U.S. military law for application to international war among the signatory countries.
Ethical warfare As the
modernization of the 1806 Articles of War (An Act for Establishing Rules and Articles for the Government of the Armies of the United States), the Lieber Code defines and describes what is a state of
civil war, what is
military occupation, and explains the politico-military purposes of war; explains what are the permissible and the impermissible military means an army can employ to fight and win a war; and defines and describes the nature of the
nation-state, the nature of national
sovereignty, and what is
rebellion. The Code requires the humane, ethical treatment of civil populations under the military occupation of the Union army, and forbids the
policy of killing prisoners of war – except when taking prisoners endangers the capturing unit. Moreover, concerning the ethics of fighting a
civil war, Article 70, Section III stipulates that "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 law and usages of war." The Code forbids
torture as warfare; thus Article 44, Section II prohibits "all wanton violence committed against persons in the invaded country, all destruction of property not commanded by the authorized officer, all robbery, all pillage or sacking, even after taking a place by main force, all rape, wounding, maiming, or killing of such inhabitants, are prohibited under the penalty of death, or such other severe punishment as may seem adequate for the gravity of the offense. A soldier, officer, or private, in the act of committing such violence, and disobeying a superior ordering him to abstain from it, may be lawfully killed on the spot by such superior."
Black prisoners of war The Lieber Code military law concorded with the
Emancipation Proclamation (1 January 1863) and prohibited racial discrimination against
black soldiers of the Union army, specifically the Confederate Army denying them the rights and privileges of prisoners of war. Those stipulations of U.S. military law specifically addressed the Confederate government's proclamation that the
Confederate Army would treat captured black soldiers of the Union army as escaped slaves, and not as prisoners of war, subject either to summary execution or to re-enslavement in the Confederacy; likewise, the white officers commanding the captured black soldiers would be denied prisoner-of-war status and would be arrested, tried, and condemned as common criminals for helping slaves escape human bondage.
Hard measures Regarding a successful military occupation, the Lieber Code proposed a reciprocal relationship between the U.S. military authority and the Confederate civilian population, whose co-operation with the military authority would ensure considerations and good treatment for the civilian populace; that against guerrilla warfare and armed resistance to
martial law the Union army would subject the insubordinate enemy civilians to imprisonment and death. Moreover, to defend against the Confederate Army's violations of the laws of war by way of irregular fighters, the Lieber Code allowed
retaliation by musketry against Confederate POWs, and allowed the summary execution of captured enemy civilians (spies, saboteurs,
francs-tireurs, guerrillas) caught attacking the Union army and the United States. In the 19th century, the Lieber Code legalized limited circumstances for retaliation against enemies for acts such as giving no quarter, reasoning "a reckless enemy ... leaves to his opponent no other means of securing himself against the repetition of barbarous outrage." (article 27) "Retaliation shall only be resorted to after careful inquiry into the real occurrence, and the character of the misdeeds that may demand retribution."(article 28) However, retribution is limited: "Unjust or inconsiderate retaliation removes the belligerents farther and farther from the mitigating rules of regular war, and by rapid steps leads them nearer to the internecine wars of savages."(article 28) As he believed war's ultimate goal is to bring peace, Lieber preferred for short wars fought and won with decisive warfare, as proposed in the strategy and tactics of the Prussian military science of
Carl von Clausewitz. To that end, the Lieber Code legitimized and justified aggressive war to expand the operational range of the Union army's prosecution of the civil war to conquer the Confederacy and free the slaves.
Occupation of the Confederacy For the conquest and military occupation of the
Confederate States of America (February 8, 1861 – May 9, 1865), General
William Tecumseh Sherman based his Special Field Orders No. 120 (November 9, 1864) upon General Orders No. 100 (April 24, 1863) for the Union army. To realize a peaceful
military occupation of the state of Georgia, Special Field Order No. 120 stipulated that "in districts and neighborhoods where the army is unmolested no destruction of such property should be permitted; but, should
guerrillas or
bushwhackers molest our march, or should the inhabitants burn bridges, obstruct roads, or otherwise manifest local hostility, then army commanders should order and enforce a devastation more or less relentless according to the measure of such hostility." Moreover, the Lieber Code (General Orders No. 100, April 24, 1863) was the military law applied to the prosecution of
war crimes and for equal prisoner-of-war exchanges between the Union army and the Confederate Army, regardless of the skin color of the soldier. ==Legacy==