This reference book analyses more than a thousand wars waged from 1816 to 2008 using coding methods from the Correlates of War Project, which aims to reveal the underlying patterns and causes of war. 'Resort to War' lists and categorises all violent conflicts with 1,000 or more battle deaths and provides a narrative for each struggle. The volume distinguishes between traditional interstate war, the phenomenon of extra-state war as evidenced by the Al-Qaeda-USA conflagration, intra-state war, and the new category of non-state ethnic wars.