Professor Francis Lieber, circa 1860s (U.S. Library of Congress, public domain).

Issued by President Abraham Lincoln on April 24, 1863 as “General Orders, No. 100: Instructions for the Government of Armies of the United States in the Field,” the “Lieber Code” defined how regular and volunteer military personnel in service to the United States were expected to behave toward one another, toward civilians and toward those they considered to be the enemy—Confederate States government officials, sailors, soldiers, spies, and others supporting the Confederacy.

Those instructions were researched and drafted by Francis Lieber, a native of the Kingdom of Prussia who became a professor of American history and political science in South Carolina roughly a decade after arriving as an immigrant in the United States. Professor Lieber, who later joined the faculty of what is, today, Columbia University, also became known for his creation of the maxim, “Nullum jus sine officio, nullum officium sine jure” (translation: “No right without its duties, no duty without its rights”), which was inscribed on his personal stationery.

According to Jenny Gesley, Ph.D., a legal specialist at the United States Library of Congress, Professor Lieber “had been imprisoned as an ‘enemy of the state,’” while still a resident of Prussia “due to his liberal nationalist views and his opposition to Prussia’s political system.”

His book “On Civil Liberty and Self Government” (1853) was a bestseller and was eventually adopted as a standard college textbook. Even though he was widely known and respected in the academic community, he felt like an outsider in South Carolina, in particular because of his opposition to slavery. In 1857, he therefore accepted a position in the department of history and political science at Columbia College, the future Columbia University, and subsequently a position in Columbia Law School.

…. When the Civil War broke out in 1861, President Lincoln wanted to provide instructions to Union officers on the particularly complicated legal issues arising from non-international armed conflicts. Among these issues were whether to treat captured Confederate soldiers as traitors subject to the death penalty or as prisoners of war (POWs) and the treatment of fugitive or freed slaves…. Lieber and a committee of four generals were therefore asked to draw up a manual for Union soldiers….

By the time that the Lieber Code was finalized, it contained one hundred and fifty-seven provisions, including several that addressed “the treatment of fugitive and freed slaves that entered the Union territory.” According to Dr. Gesley:

Lieber took the view that international law did not distinguish between people based on color (Art. 58) and that the law of nature and nations has never acknowledged slavery (Art. 42). He therefore included provisions that held that fugitive slaves that escaped to the North became free (Arts. 42, 43) and that all soldiers no matter their skin color must be awarded POW status (Art.57).

The Lieber Code also spelled out how civilians and miliary prisoners of war (POWs) should be treated. The following were among the most enlightening provisions of this new code of conduct:

Article 15. Military necessity admits of all direct destruction of life or limb of armed enemies, and of other persons whose destruction is incidentally unavoidable in the armed contests of the war; it allows of the capturing of every armed enemy, and every enemy of importance to the hostile government, or of peculiar danger to the captor; it allows of all destruction of property, and obstruction of the ways and channels of traffic, travel, or communication, and of all withholding of sustenance or means of life from the enemy; of the appropriation of whatever an enemy’s country affords necessary for the subsistence and safety of the army, and of such deception as does not involve the breaking of good faith either positively pledged, regarding agreements entered into during the war, or supposed by the modern law of war to exist. Men who take up arms against one another in public war do not cease on this account to be moral beings, responsible to one another and to God.

Article 16. Military necessity does not admit of cruelty—that is, the infliction of suffering for the sake of suffering or for revenge, nor of maiming or wounding except in fight, nor of torture to extort confessions. It does not admit of the use of poison in any way, nor of the wanton devastation of a district. It admits of deception, but disclaims acts of perfidy; and, in general, military necessity does not include any act of hostility which makes the return to peace unnecessarily difficult.

Article 17 (no longer permitted under present-day international laws). War is not carried on by arms alone. It is lawful to starve the hostile belligerent, armed or unarmed, so that it leads to the speedier subjection of the enemy….

Article 21. The citizen or native of a hostile country is thus an enemy, as one of the constituents of the hostile state or nation, and as such is subjected to the hardships of the war.

Article 22. Nevertheless, as civilization has advanced during the last centuries, so has likewise steadily advanced, especially in war on land, the distinction between the private individual belonging to a hostile country and the hostile country itself, with its men in arms. The principle has been more and more acknowledged that the unarmed citizen is to be spared in person, property, and honor as much as the exigencies of war will admit.

Article 23. Private citizens are no longer murdered, enslaved, or carried off to distant parts, and the inoffensive individual is as little disturbed in his private relations as the commander of the hostile troops can afford to grant in the overruling demands of a vigorous war….

Article 26. Commanding generals may cause the magistrates and civil officers of the hostile country to take the oath of temporary allegiance or an oath of fidelity to their own victorious government or rulers, and they may expel everyone who declines to do so. But whether they do so or not, the people and their civil officers owe strict obedience to them as long as they hold sway over the district or country, at the peril of their lives….

Article 35. Commanding generals may cause the magistrates and civil officers of the hostile country to take the oath of temporary allegiance or an oath of fidelity to their own victorious government or rulers, and they may expel everyone who declines to do so. But whether they do so or not, the people and their civil officers owe strict obedience to them as long as they hold sway over the district or country, at the peril of their lives.

Article 36. If such works of art, libraries, collections, or instruments belonging to a hostile nation or government, can be removed without injury, the ruler of the conquering state or nation may order them to be seized and removed for the benefit of the said nation. The ultimate ownership is to be settled by the ensuing treaty of peace. In no case shall they be sold or given away, if captured by the armies of the United States, nor shall they ever be privately appropriated, or wantonly destroyed or injured.

Article 37. The United States acknowledge and protect, in hostile countries occupied by them, religion and morality; strictly private property; the persons of the inhabitants, especially those of women: and the sacredness of domestic relations. Offenses to the contrary shall be rigorously punished. This rule does not interfere with the right of the victorious invader to tax the people or their property, to levy forced loans, to billet soldiers, or to appropriate property, especially houses, lands, boats or ships, and churches, for temporary and military uses.

Article 38. Private property, unless forfeited by crimes or by offenses of the owner, can be seized only by way of military necessity, for the support or other benefit of the army or of the United States. If the owner has not fled, the commanding officer will cause receipts to be given, which may serve the spoliated owner to obtain indemnity….

Article 42.  Slavery, complicating and confounding the ideas of property, (that is of a thing,) and of personality, (that is of humanity,) exists according to municipal or local law only. The law of nature and nations has never acknowledged it. The digest of the Roman law enacts the early dictum of the pagan jurist, that “so far as the law of nature is concerned, all men are equal.” Fugitives escaping from a country in which they were slaves, villains, or serfs, into another country, have, for centuries past, been held free and acknowledged free by judicial decisions of European countries, even though the municipal law of the country in which the slave had taken refuge acknowledged slavery within its own dominions.

Article 43. Therefore, in a war between the United States and a belligerent which admits of slavery, if a person held in bondage by that belligerent be captured by or come as a fugitive under the protection of the military forces of the United States, such person is immediately entitled to the rights and privileges of a freeman. To return such person into slavery would amount to enslaving a free person, and neither the United States nor any officer under their authority can enslave any human being. Moreover, a person so made free by the law of war is under the shield of the law of nations, and the former owner or State can have, by the law of postliminy, no belligerent lien or claim of service.

Article 44. 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….

Article 47. Crimes punishable by all penal codes, such as arson, murder, maiming, assaults, highway robbery, theft, burglary, fraud, forgery, and rape, if committed by an American soldier in a hostile country against its inhabitants, are not only punishable as at home, but in all cases in which death is not inflicted, the severer punishment shall be preferred.

Article 48. Deserters from the American Army, having entered the service of the enemy, suffer death if they fall again into the hands of the United States, whether by capture, or being delivered up to the American Army; and if a deserter from the enemy, having taken service in the Army of the United States, is captured by the enemy, and punished by them with death or otherwise, it is not a breach against the law and usages of war, requiring redress or retaliation.

Article 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.

Article 50. Moreover, citizens who accompany an army for whatever purpose, such as sutlers, editors, or reporters of journals, or contractors, if captured, may be made prisoners of war, and be detained as such. The monarch and members of the hostile reigning family, male or female, the chief, and chief officers of the hostile government, its diplomatic agents, and all persons who are of particular and singular use and benefit to the hostile army or its government, are, if captured on belligerent ground, and if unprovided with a safe conduct granted by the captor’s government, prisoners of war.

Article 51. If the people of that portion of an invaded country which is not yet occupied by the enemy, or of the whole country, at the approach of a hostile army, rise, under a duly authorized levy en masse to resist the invader, they are now treated as public enemies, and, if captured, are prisoners of war.

Article 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. If, however, the people of a country, or any portion of the same, already occupied by an army, rise against it, they are violators of the laws of war, and are not entitled to their protection.

Article 53. The enemy’s chaplains, officers of the medical staff, apothecaries, hospital nurses and servants, if they fall into the hands of the American Army, are not prisoners of war, unless the commander has reasons to retain them. In this latter case; or if, at their own desire, they are allowed to remain with their captured companions, they are treated as prisoners of war, and may be exchanged if the commander sees fit….

Article 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.

Article 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 not individual crimes or offenses. No belligerent has a right to declare that enemies of a certain class, color, or condition, when properly organized as soldiers, will not be treated by him as public enemies.

Article 58. The law of nations knows no distinction of color, and if an enemy of the United States should enslave and sell any captured persons of their army, it would be a case for the severest retaliation, if not redressed upon complaint. The United States cannot retaliate by enslavement; therefore death must be the retaliation for this crime against the law of nations.

Article 59. A prisoner of war remains answerable for his crimes committed against the captor’s army or people, committed before he was captured, and for which he has not been punished by his own authorities. All prisoners of war are liable to the infliction of retaliatory measures.

Article 60. It is against the usage of modern war to resolve, in hatred and revenge, to give no quarter. No body of troops has the right to declare that it will not give, and therefore will not expect, quarter; but a commander is permitted to direct his troops to give no quarter, in great straits, when his own salvation makes it impossible to cumber himself with prisoners.

Article 61. Troops that give no quarter have no right to kill enemies already disabled on the ground, or prisoners captured by other troops.

Article 62. All troops of the enemy known or discovered to give no quarter in general, or to any portion of the army, receive none.

Article 63. Troops who fight in the uniform of their enemies, without any plain, striking, and uniform mark of distinction of their own, can expect no quarter….

Article 65. The use of the enemy’s national standard, flag, or other emblem of nationality, for the purpose of deceiving the enemy in battle, is an act of perfidy by which they lose all claim to the protection of the laws of war….

Article 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.

Article 68. Modern wars are not internecine wars, in which the killing of the enemy is the object. The destruction of the enemy in modern war, and, indeed, modern war itself, are means to obtain that object of the belligerent which lies beyond the war. Unnecessary or revengeful destruction of life is not lawful.

Article 69. Outposts, sentinels, or pickets are not to be fired upon, except to drive them in, or when a positive order, special or general, has been issued to that effect.

Article 70. 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.

Article 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.

Article 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 prisoner, and the appropriation of such valuables or money is considered dishonorable, and is prohibited. Nevertheless, if large sums are found upon the persons of prisoners, or in their possession, they shall be taken from them, and the surplus, after providing for their own support, appropriated for the use of the army, under the direction of the commander, unless otherwise ordered by the government. Nor can prisoners claim, as private property, large sums found and captured in their train, although they have been placed in the private luggage of the prisoners.

Article 73. All officers, when captured, must surrender their side arms to the captor. They may be restored to the prisoner in marked cases, by the commander, to signalize admiration of his distinguished bravery or approbation of his humane treatment of prisoners before his capture. The captured officer to whom they may be restored can not wear them during captivity.

Article 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.

Article 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.

Article 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.

Article 77. A prisoner of war who escapes may be shot, or otherwise killed in his flight; but neither death nor any other punishment shall be inflicted upon him simply for the attempt to escape, which the law of war does not consider a crime. Stricter means of security shall be used after an unsuccessful attempt at escape. If, however, a conspiracy is discovered, the purpose of which is a united or general escape, the conspirators may be rigorously punished, even with death; and capital punishment may also be inflicted upon prisoners of war discovered to have plotted rebellion against the authorities of the captors, whether in union with fellow prisoners or other persons.

Article 78. If prisoners of war, having given no pledge nor made any promise on their honor, forcibly or otherwise escape, and are captured again in battle after having rejoined their own army, they shall not be punished for their escape, but shall be treated as simple prisoners of war, although they will be subjected to stricter confinement.

Article 79. Every captured wounded enemy shall be medically treated, according to the ability of the medical staff.

Article 80. Honorable men, when captured, will abstain from giving to the enemy information concerning their own army, and the modern law of war permits no longer the use of any violence against prisoners in order to extort the desired information or to punish them for having given false information.

Article 81. Partisans are soldiers armed and wearing the uniform of their army, but belonging to a corps which acts detached from the main body for the purpose of making inroads into the territory occupied by the enemy. If captured, they are entitled to all the privileges of the prisoner of war.

Article 82. Men, or squads of men, who commit hostilities, whether by fighting, or inroads for destruction or plunder, or by raids of any kind, without commission, without being part and portion of the organized hostile army, and without sharing continuously in the war, but who do so with intermitting returns to their homes and avocations, or with the occasional assumption of the semblance of peaceful pursuits, divesting themselves of the character or appearance of soldiers—such men, or squads of men, are not public enemies, and, therefore, if captured, are not entitled to the privileges of prisoners of war, but shall be treated summarily as highway robbers or pirates.

Article 83. Scouts, or single soldiers, if disguised in the dress of the country or in the uniform of the army hostile to their own, employed in obtaining information, if found within or lurking about the lines of the captor, are treated as spies, and suffer death.

Article 84. Armed prowlers, by whatever names they may be called, or persons of the enemy’s territory, who steal within the lines of the hostile army for the purpose of robbing, killing, or of destroying bridges, roads or canals, or of robbing or destroying the mail, or of cutting the telegraph wires, are not entitled to the privileges of the prisoner of war.

Article 85. War-rebels are persons within an occupied territory who rise in arms against the occupying or conquering army, or against the authorities established by the same. If captured, they may suffer death, whether they rise singly, in small or large bands, and whether called upon to do so by their own, but expelled, government or not. They are not prisoners of war; nor are they if discovered and secured before their conspiracy has matured to an actual rising or armed violence….

Article 88. A spy is a person who secretly, in disguise or under false pretense, seeks information with the intention of communicating it to the enemy. The spy is punishable with death by hanging by the neck, whether or not he succeeds in obtaining the information or in conveying it to the enemy.

Article 89. If a citizen of the United States obtains information in a legitimate manner, and betrays it to the enemy, be he a military or civil officer, or a private citizen, he shall suffer death.

Article 90. A traitor under the law of war, or a war-traitor, is a person in a place or district under Martial Law who, unauthorized by the military commander, gives information of any kind to the enemy, or holds intercourse with him.

Article 91. The war-traitor is always severely punished. If his offense consists in betraying to the enemy anything concerning the condition, safety, operations, or plans of the troops holding or occupying the place or district, his punishment is death.

Article 92. If the citizen or subject of a country or place invaded or conquered gives information to his own government, from which he is separated by the hostile army, or to the army of his government, he is a war-traitor, and death is the penalty of his offense….

Article 94. No person having been forced by the enemy to serve as guide is punishable for having done so.

Article 95. If a citizen of a hostile and invaded district voluntarily serves as a guide to the enemy, or offers to do so, he is deemed a war-traitor, and shall suffer death.

Article 96. A citizen serving voluntarily as a guide against his own country commits treason, and will be dealt with according to the law of his country.

Article 97. Guides, when it is clearly proved that they have misled intentionally, may be put to death.

Article 98. An unauthorized or secret communication with the enemy is considered treasonable by the law of war. Foreign residents in an invaded or occupied territory, or foreign visitors in the same, can claim no immunity from this law. They may communicate with foreign parts, or with the inhabitants of the hostile country, so far as the military authority permits, but no further. Instant expulsion from the occupied territory would be the very least punishment for the infraction of this rule.

Article 99. A messenger carrying written dispatches or verbal messages from one portion of the army, or from a besieged place, to another portion of the same army, or its government, if armed, and in the uniform of his army, and if captured, while doing so, in the territory occupied by the enemy, is treated by the captor as a prisoner of war. If not in uniform, nor a soldier, the circumstances connected with his capture must determine the disposition that shall be made of him.

Article 100. A messenger or agent who attempts to steal through the territory occupied by the enemy, to further, in any manner, the interests of the enemy, if captured, is not entitled to the privileges of the prisoner of war, and may be dealt with according to the circumstances of the case.

Article 101. While deception in war is admitted as a just and necessary means of hostility, and is consistent with honorable warfare, the common law of war allows even capital punishment for clandestine or treacherous attempts to injure an enemy, because they are so dangerous, and it is difficult to guard against them.

Article 102. The law of war, like the criminal law regarding other offenses, makes no difference on account of the difference of sexes, concerning the spy, the war-traitor, or the war-rebel.

Article 103. Spies, war-traitors, and war-rebels are not exchanged according to the common law of war. The exchange of such persons would require a special cartel, authorized by the government, or, at a great distance from it, by the chief commander of the army in the field….

Article 105. Exchanges of prisoners take place—number for number—rank for rank wounded for wounded—with added condition for added condition—such, for instance, as not to serve for a certain period.

Article 106. In exchanging prisoners of war, such numbers of persons of inferior rank may be substituted as an equivalent for one of superior rank as may be agreed upon by cartel, which requires the sanction of the government, or of the commander of the army in the field.

Article 107. A prisoner of war is in honor bound truly to state to the captor his rank; and he is not to assume a lower rank than belongs to him, in order to cause a more advantageous exchange, nor a higher rank, for the purpose of obtaining better treatment. Offenses to the contrary have been justly punished by the commanders of released prisoners, and may be good cause for refusing to release such prisoners.

Article 108. The surplus number of prisoners of war remaining after an exchange has taken place is sometimes released either for the payment of a stipulated sum of money, or, in urgent cases, of provision, clothing, or other necessaries. Such arrangement, however, requires the sanction of the highest authority.

Article 109. The exchange of prisoners of war is an act of convenience to both belligerents. If no general cartel has been concluded, it cannot be demanded by either of them. No belligerent is obliged to exchange prisoners of war. A cartel is voidable as soon as either party has violated it.

Article 110. No exchange of prisoners shall be made except after complete capture, and after an accurate account of them, and a list of the captured officers, has been taken.

Article 111. The bearer of a flag of truce cannot insist upon being admitted. He must always be admitted with great caution. Unnecessary frequency is carefully to be avoided.

Article 112. If the bearer of a flag of truce offer himself during an engagement, he can be admitted as a very rare exception only. It is no breach of good faith to retain such flag of truce, if admitted during the engagement. Firing is not required to cease on the appearance of a flag of truce in battle.

Article 113. If the bearer of a flag of truce, presenting himself during an engagement, is killed or wounded, it furnishes no ground of complaint whatever.

Article 114. If it be discovered, and fairly proved, that a flag of truce has been abused for surreptitiously obtaining military knowledge, the bearer of the flag thus abusing his sacred character is deemed a spy. So sacred is the character of a flag of truce, and so necessary is its sacredness, that while its abuse is an especially heinous offense, great caution is requisite, on the other hand, in convicting the bearer of a flag of truce as a spy.

Article 115. It is customary to designate by certain flags (usually yellow) the hospitals in places which are shelled, so that the besieging enemy may avoid firing on them. The same has been done in battles, when hospitals are situated within the field of the engagement….

Article 119. Prisoners of war may be released from captivity by exchange, and, under certain circumstances, also by parole.

Article 120. The term Parole designates the pledge of individual good faith and honor to do, or to omit doing, certain acts after he who gives his parole shall have been dismissed, wholly or partially, from the power of the captor….

Article 122. The parole applies chiefly to prisoners of war whom the captor allows to return to their country, or to live in greater freedom within the captor’s country or territory, on conditions stated in the parole.

Article 123. Release of prisoners of war by exchange is the general rule; release by parole is the exception.

Article 124. Breaking the parole is punished with death when the person breaking the parole is captured again. Accurate lists, therefore, of the paroled persons must be kept by the belligerents.

Article 125. When paroles are given and received there must be an exchange of two written documents, in which the name and rank of the paroled individuals are accurately and truthfully stated.

Article 126. Commissioned officers only are allowed to give their parole, and they can give it only with the permission of their superior, as long as a superior in rank is within reach.

Article 127. No noncommissioned officer or private can give his parole except through an officer. Individual paroles not given through an officer are not only void, but subject the individuals giving them to the punishment of death as deserters. The only admissible exception is where individuals, properly separated from their commands, have suffered long confinement without the possibility of being paroled through an officer.

Article 128. No paroling on the battlefield; no paroling of entire bodies of troops after a battle; and no dismissal of large numbers of prisoners, with a general declaration that they are paroled, is permitted, or of any value.

Article 129. In capitulations for the surrender of strong places or fortified camps the commanding officer, in cases of urgent necessity, may agree that the troops under his command shall not fight again during the war, unless exchanged.

Article 130. The usual pledge given in the parole is not to serve during the existing war, unless exchanged. This pledge refers only to the active service in the field, against the paroling belligerent or his allies actively engaged in the same war. These cases of breaking the parole are patent acts, and can be visited with the punishment of death; but the pledge does not refer to internal service, such as recruiting or drilling the recruits, fortifying places not besieged, quelling civil commotions, fighting against belligerents unconnected with the paroling belligerents, or to civil or diplomatic service for which the paroled officer may be employed.

Article 131. If the government does not approve of the parole, the paroled officer must return into captivity, and should the enemy refuse to receive him, he is free of his parole.

Article 132. A belligerent government may declare, by a general order, whether it will allow paroling, and on what conditions it will allow it. Such order is communicated to the enemy.

Article 133. No prisoner of war can be forced by the hostile government to parole himself, and no government is obliged to parole prisoners of war, or to parole all captured officers, if it paroles any. As the pledging of the parole is an individual act, so is paroling, on the other hand, an act of choice on the part of the belligerent.

Article 134. The commander of an occupying army may require of the civil officers of the enemy, and of its citizens, any pledge he may consider necessary for the safety or security of his army, and upon their failure to give it he may arrest, confine, or detain them….

Article 144. So soon as a capitulation is signed, the capitulator has no right to demolish, destroy, or injure the works, arms, stores, or ammunition, in his possession, during the time which elapses between the signing and the execution of the capitulation, unless otherwise stipulated in the same….

Article 146. Prisoners taken in the act of breaking an armistice must be treated as prisoners of war, the officer alone being responsible who gives the order for such a violation of an armistice. The highest authority of the belligerent aggrieved may demand redress for the infraction of an armistice….

Article 148. The law of war does not allow proclaiming either an individual belonging to the hostile army, or a citizen, or a subject of the hostile government, an outlaw, who may be slain without trial by any captor, any more than the modern law of peace allows such intentional outlawry; on the contrary, it abhors such outrage. The sternest retaliation should follow the murder committed in consequence of such proclamation, made by whatever authority. Civilized nations look with horror upon offers of rewards for the assassination of enemies as relapses into barbarism.

Article 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.

Article 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.

Article 151. The term rebellion is applied to an insurrection of large extent, and is usually a war between the legitimate government of a country and portions of provinces of the same who seek to throw off their allegiance to it and set up a government of their own….

Article 153. Treating captured rebels as prisoners of war, exchanging them, concluding of cartels, capitulations, or other warlike agreements with them; addressing officers of a rebel army by the rank they may have in the same; accepting flags of truce; or, on the other hand, proclaiming Martial Law in their territory, or levying war-taxes or forced loans, or doing any other act sanctioned or demanded by the law and usages of public war between sovereign belligerents, neither proves nor establishes an acknowledgment of the rebellious people, or of the government which they may have erected, as a public or sovereign power. Nor does the adoption of the rules of war toward rebels imply an engagement with them extending beyond the limits of these rules. It is victory in the field that ends the strife and settles the future relations between the contending parties.

Article 154. Treating, in the field, the rebellious enemy according to the law and usages of war has never prevented the legitimate government from trying the leaders of the rebellion or chief rebels for high treason, and from treating them accordingly, unless they are included in a general amnesty.

Article 155. All enemies in regular war are divided into two general classes—that is to say, into combatants and noncombatants, or unarmed citizens of the hostile government. The military commander of the legitimate government, in a war of rebellion, distinguishes between the loyal citizen in the revolted portion of the country and the disloyal citizen. The disloyal citizens may further be classified into those citizens known to sympathize with the rebellion without positively aiding it, and those who, without taking up arms, give positive aid and comfort to the rebellious enemy without being bodily forced thereto.

Article 156. Common justice and plain expediency require that the military commander protect the manifestly loyal citizens, in revolted territories, against the hardships of the war as much as the common misfortune of all war admits. The commander will throw the burden of the war, as much as lies within his power, on the disloyal citizens, of the revolted portion or province, subjecting them to a stricter police than the noncombatant enemies have to suffer in regular war; and if he deems it appropriate, or if his government demands of him that every citizen shall, by an oath of allegiance, or by some other manifest act, declare his fidelity to the legitimate government, he may expel, transfer, imprison, or fine the revolted citizens who refuse to pledge themselves anew as citizens obedient to the law and loyal to the government. Whether it is expedient to do so, and whether reliance can be placed upon such oaths, the commander or his government have the right to decide.

Article 157. Armed or unarmed resistance by citizens of the United States against the lawful movements of their troops is levying war against the United States, and is therefore treason.

Sources:

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