International Humanitarian Law (IHL) also known as "law of armed conflict" concerns the jus in bello, the law relating to the protection of victims, environment, and property during war or armed conflict. Among the groups affected under IHL are humanitarian workers, displaced persons, and refugees. See also the International Criminal Law and the International Human Rights categories of EISIL. Resources on jus ad bellum may be found in the the Use of Force section of EISIL, under the subcategory Law of Armed Conflict.
In-depth assistance on researching international humanitarian law is available in the ASIL Guide to Electronic Resources for International Law which includes a continuously updated chapter on this subject.