“War crimes” include grave breaches of the Geneva Conventions and other serious violations of the laws and customs applicable in international armed conflict and in conflicts “not of an international character” listed in the Rome Statute, when they are committed as part of a plan or policy or on a large scale. These 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; [The Economist – “For the first time since it started to function in 2002, the International Criminal Court at The Hague has passed a guilty verdict on a warlord for perpetrating, among other things, rape as an act of war.”]
• conscripting or enlisting children under the age of 15 years into armed forces or groups or using them to participate actively in hostilities.”