This book, now fully updated and in its third edition, explains the law relating to the conduct of hostilities and provides guidance on difficult or controversial aspects of the law. It covers who or what may legitimately be attacked and what precautions must be taken to protect civilians, cultural property or the natural environment. It deals with the responsibility of commanders and how the law is enforced. There are also chapters on internal armed conflicts and the security aspects of belligerent occupation. -- .