Summary: This book provides a modern and basic introduction to a branch of international law constantly gaining in importance in international life, namely international humanitarian law (IHL), the law of armed conflict. It is constructed in a way that is suitable for self-study. Subject matters are discussed in self-contained chapters, allowing each to be studied independently of the others. Among the subjects discussed are, inter alia: the relationship between jus ad bellum / jus in bello, the historical evolution of IHL, the basic principles and sources of IHL, Martens Clause, international and non-international armed conflicts, material, spatial, personal, and temporal scope of the application of IHL, special agreements under IHL, the role of the International Committee of the Red Cross, targeting, objects specifically protected against attack, prohibited weapons, perfidy, reprisals, assistance of the wounded and sick, the definition of combatants, protection of prisoners of war, protection of civilians, occupied territories, protective emblems, sea warfare, neutrality, the implementation of IHL.