This course will focus on the concept of war in international law and as applied today in national law. We will use a draft version of my new book 'War' which covers most aspects of the international law applicable to wars and armed conflicts. Starting with a look at the continuing relevance of the concept of War we will then examine how War became outlawed as an institution within international law and the use of force became regulated through the the Charter with the most recent codification of the crime of aggression. Turning to the application of humanitarian law and the principles applicable to the conduct of hostilities, the focus is on the underlying references back to war - as has occurred with the notion of 'law of war detainees' in Guantanamo and Afghanistan and the targeting of objects and people from ISIS and other groups directly contributing to the 'war sustaining economy'. Particular attention will be paid to the traditional law of economic warfare at sea (Prize law) which allows for the seizure of enemy property and interception of all shipping to seize 'contraband of war'. Lastly we look at recent developments concerning war reparations and accountability war crimes. The aim is to evaluate the uses and abuses of the concept of war in law.