Even though the prohibition of certain behavior in the conduct of armed conflict can be traced back many centuries, the concept of war crimes developed particularly at the end of the 19th century and beginning of the 20th century, when international humanitarian law, also known as the law of armed conflict, was codified. The Hague Conventions adopted in 1899 and 1907 focus on the prohibition to warring parties to use certain means and methods of warfare. Several other related treaties have been adopted since then. In contrast, the Geneva Convention of 1864 and subsequent Geneva Conventions, notably the four 1949 Geneva Conventions and the two 1977 Additional Protocols, focus on the protection of persons not or no longer taking part in hostilities. Both Hague Law and Geneva Law identify several of the violations of its norms, though not all, as war crimes. However there is no one single document in international law that codifies all war crimes. Lists of war crimes can be found in both international humanitarian law and international criminal law treaties, as well as in international customary law.
The 1949 Geneva Conventions have been ratified by all Member States of the United Nations, while the Additional Protocols and other international humanitarian law treaties have not yet reached the same level of acceptance. However, many of the rules contained in these treaties have been considered as part of customary law and, as such, are binding on all States (and other parties to the conflict), whether or not States have ratified the treaties themselves. In addition, many rules of customary international law apply in both international and non-international armed conflict, expanding in this way the protection afforded in non-international armed conflicts, which are regulated only by common article 3 of the four Geneva Conventions and Additional Protocol II.
Article 8 War Crimes
War crimes are those violations of international humanitarian law (treaty or customary law) that incur individual criminal responsibility under international law. As a result, and in contrast to the crimes of genocide and crimes against humanity, war crimes must always take place in the context of an armed conflict, either international or non-international.
What constitutes a war crime may differ, depending on whether an armed conflict is international or non-international. For example, Article 8 of the Rome Statute categorises war crimes as follows:
From a more substantive perspective, war crimes could be divided into: a) war crimes against persons requiring particular protection; b) war crimes against those providing humanitarian assistance and peacekeeping operations; c) war crimes against property and other rights; d) prohibited methods of warfare; and e) prohibited means of warfare.
Some examples of prohibited acts include: murder; mutilation, cruel treatment and torture; taking of hostages; intentionally directing attacks against the civilian population; intentionally directing attacks against buildings dedicated to religion, education, art, science or charitable purposes, historical monuments or hospitals; pillaging; rape, sexual slavery, forced pregnancy or any other form of sexual violence; conscripting or enlisting children under the age of 15 years into armed forces or groups or using them to participate actively in hostilities.
War crimes contain two main elements:
In contrast to genocide and crimes against humanity, war crimes can be committed against a diversity of victims, either combatants or non-combatants, depending on the type of crime. In international armed conflicts, victims include wounded and sick members of armed forces in the field and at sea, prisoners of war and civilian persons. In the case of non-international armed conflicts, protection is afforded to persons taking no active part in the hostilities, including members of armed forces who have laid down their arms and those placed ‘hors de combat’ by sickness, wounds, detention, or any other cause. In both types of conflicts protection is also afforded to medical and religious personnel, humanitarian workers and civil defence staff.