Law of war
At that point, an unlawful combatant may be interrogated, tried, imprisoned, and even executed for their violation of the laws of war pursuant to the domestic law of their captor, but they are still entitled to certain additional protections, including that they be "treated with humanity and, in case of trial, shall not be deprived of the rights of fair and regular trial." (Fourth Geneva Convention Article 5.)

International treaties on the laws of war: List of declarations, conventions, treaties, and judgments on the laws of war:

1856 Paris Declaration Respecting Maritime Law abolished privateering.
1863 United States military adopts the Lieber Code, a compilation of extant international norms on the treatment of civilians assembled by German scholar Franz Lieber.
1864 Geneva Convention for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field.
1868 St. Petersburg Declaration, officially the Declaration Renouncing the Use, in Time of War, of Explosive Projectiles Under 400 Grammes Weight, renounced the usage of explosive projectiles with a mass of less than 400 grams.
1874 Project of an International Declaration concerning the Laws and Customs of War (Brussels Declaration). Signed in Brussels 27 August. This agreement never entered into force, but formed part of the basis for the codification of the laws of war at the 1899 Hague Peace Conference.
1880 Manual of the Laws and Customs of War at Oxford. At its session in Geneva in 1874 the Institute of International Law appointed a committee to study the Brussels Declaration of the same year and to submit to the Institute its opinion and supplementary proposals on the subject. The work of the Institute led to the adoption of the Manual in 1880 and it went on to form part of the basis for the codification of the laws of war at the 1899 Hague Peace Conference.
1899 Hague Conventions consisted of three main sections and three additional declarations:
I – Pacific Settlement of International Disputes
II – Laws and Customs of War on Land
III – Adaptation to Maritime Warfare of Principles of Geneva Convention of 1864
Declaration I – On the Launching of Projectiles and Explosives from Balloons
Declaration II – On the Use of Projectiles the Object of Which is the Diffusion of Asphyxiating or Deleterious Gases
Declaration III – On the Use of Bullets Which Expand or Flatten Easily in the Human Body
1907 Hague Conventions had thirteen sections, of which twelve were ratified and entered into force, and two declarations:
I – The Pacific Settlement of International Disputes
II – The Limitation of Employment of Force for Recovery of Contract Debts
III – The Opening of Hostilities
IV – The Laws and Customs of War on Land
V – The Rights and Duties of Neutral Powers and Persons in Case of War on Land
VI – The Status of Enemy Merchant Ships at the Outbreak of Hostilities
VII – The Conversion of Merchant Ships into War-ships
VIII – The Laying of Automatic Submarine Contact Mines
IX – Bombardment by Naval Forces in Time of War
X – Adaptation to Maritime War of the Principles of the Geneva Convention
XI – Certain Restrictions with Regard to the Exercise of the Right of Capture in Naval War
XII – The Creation of an International Prize Court [Not Ratified]*
XIII – The Rights and Duties of Neutral Powers in Naval War
Declaration I – extending Declaration II from the 1899 Conference to other types of aircraft
Declaration II – on the obligatory arbitration
1909 London Declaration concerning the Laws of Naval War largely reiterated existing law, although it showed greater regard to the rights of neutral entities. Never went into effect.
1922 The Washington Naval Treaty, also known as the Five-Power Treaty (6 February)
1923 Hague Draft Rules of Aerial Warfare. Never adopted in a legally binding form.
1925 Geneva protocol for the Prohibition of the Use in War of Asphyxiating, Poisonous or Other Gases, and of Bacteriological Methods of Warfare.
1927–1930 Greco-German arbitration tribunal
1928 General Treaty for Renunciation of War as an Instrument of National Policy (also known as the Pact of Paris or Kellogg-Briand Pact)
1929 Geneva Convention, Relative to the treatment of prisoners of war.
1929 Geneva Convention on the Amelioration of the Condition of the Wounded and Sick in Armies in the Field,
1930 Treaty for the Limitation and Reduction of Naval Armament (22 April)
1935 Roerich Pact
1936 Second London Naval Treaty (25 March)
1938 Amsterdam Draft Convention for the Protection of Civilian Populations Against New Engines of War. (Officially the Draft Convention for the Protection of Civilian Populations Against New Engines of War. Amsterdam, 1938). This convention was never ratified.
1938 League of Nations declaration for the "Protection of Civilian Populations Against Bombing From the Air in Case of War
1945 United Nations Charter (entered into force on October 24, 1945)
1946 Judgment of the International Military Tribunal at Nuremberg
1947 Nuremberg Principles formulated under UN General Assembly Resolution 177, 21 November 1947
1948 United Nations Convention on the Prevention and Punishment of the Crime of Genocide
1949 Geneva Conventions
Geneva Convention I for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field
Geneva Convention II for the Amelioration of the Condition of Wounded, Sick and Shipwrecked Members of Armed Forces at Sea
Geneva Convention III Relative to the Treatment of Prisoners of War
Geneva Convention IV Relative to the Protection of Civilian Persons in Time of War
1954 Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict
1971 Zagreb Resolution of the Institute of International Law on Conditions of Application of Humanitarian Rules of Armed Conflict to Hostilities in which the United Nations Forces May be Engaged
1974 United Nations Declaration on the Protection of Women and Children in Emergency and Armed Conflict
1977 United Nations Convention on the Prohibition of Military or Any Other Hostile Use of Environmental Modification Techniques
1977 Geneva Protocol I Additional to the Geneva Conventions of 12 August 1949, and Relating to the Protection of Victims of International Armed Conflicts
1977 Geneva Protocol II Additional to the Geneva Conventions of 12 August 1949, and Relating to the Protection of Victims of Non-International Armed Conflicts
1978 Red Cross Fundamental Rules of International Humanitarian Law Applicable in Armed Conflicts
1980 United Nations Convention on Prohibitions or Restrictions on the Use of Certain Conventional Weapons Which May be Deemed to be Excessively Injurious or to Have Indiscriminate Effects (CCW)
1980 Protocol I on Non-Detectable Fragments
1980 Protocol II on Prohibitions or Restrictions on the Use of Mines, Booby-Traps and Other Devices
1980 Protocol III on Prohibitions or Restrictions on the Use of Incendiary Weapons
1995 Protocol IV on Blinding Laser Weapons
1996 Amended Protocol II on Prohibitions or Restrictions on the Use of Mines, Booby-Traps and Other Devices
Protocol on Explosive Remnants of War (Protocol V to the 1980 Convention), 28 November 2003 (entered into force 12 November 2006)
1994 San Remo Manual on International Law Applicable to Armed Conflicts at Sea
1994 ICRC/UNGA Guidelines for Military Manuals and Instructions on the Protection of the Environment in Time of Armed Conflict
1994 UN Convention on the Safety of United Nations and Associated Personnel.
1996 The International Court of Justice advisory opinion on the Legality of the Threat or Use of Nuclear Weapons
1997 Ottawa Treaty - Convention on the Prohibition of the Use, Stockpiling, Production and Transfer of Anti-Personnel Mines and on their Destruction
1998 Rome Statute of the International Criminal Court (entered into force 1 July 2002)
2000 Optional Protocol on the Involvement of Children in Armed Conflict (entered into force 12 February 2002)
2005 Geneva Protocol III Additional to the Geneva Conventions of 12 August 1949, and Relating to the Adoption of an Additional Distinctive Emblem
2008 Convention on Cluster Munitions (entered into force 1 August 2010)
2017 Treaty on the Prohibition of Nuclear Weapons (entered into force 22 January 2021)

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Citations: 

General sources: Greenberg, Joel (2011), "Illegal Targeting of Civilians", www.crimesofwar.org, archived from the original on 2013-07-06, retrieved 4 July 2013
Johnson, James Turner (198), Just War Tradition and the Restraint of War: A Moral and Historical Inquiry, New Jersey: Princeton University Press
Lamb, A. (2013), Ethics and the Laws of War: The moral justification of legal norms, Routledge
Moreno-Ocampo, Luis (9 February 2006), OTP letter to senders re Iraq (PDF), International Criminal Court
Moseley, Alex (2009), "Just War Theory", The Internet Encyclopedia of Philosophy
Roberts, Adam; Guelff, Richard, eds. (2000), Documents on the Laws of War (Third ed.