In this unique and highly readable book, written for the intelligent layperson, one of the world's leading experts in international law uses historical case studies to examine the basis on which war is waged and how the global legal environment shapes current events. The international rules governing the use of military force are under unprecedented scrutiny following the removal of Slobodan Milosevic and Saddam Hussein in wars not sanctioned by the United Nations (UN). Michael Byers ' authoritative book addresses five broad issues: u.n. Security Council authorization, self-defence against terrorism, pre-emptive war, humanitarian and pro-democratic intervention, and the protection of civilians and combatants during armed conflict. His conclusion is that the global legal environment matters and its influence is often understated and undervalued. War Law is an informative and stimulating read about these continually divisive, critically important issues.