This year in review will first discuss the major developments that contributed towards the formation or enforcement of international humanitarian law. Despite the many positive developments in the elucidation of international humanitarian law, 2009 witnessed the continuation of violent armed conflict around the world, not least in Sri Lanka where the long standing armed conflict came to a bloody conclusion amidst allegations of summary executions and other serious violations of international humanitarian law. Two other conflicts involving Israel/Gaza and Russia/Georgia which took place in 2008 and early 2009, resulted in the release of two influential international investigative reports, each of which alleged serious violations of international humanitarian law and called for the enforcement of criminal accountability. The election of Barack Obama marked a significant shift in the attitude of the United States to terrorism and detention with the new President immediately announcing on taking office, the closure of Guantánamo Bay.