Book excerpt: How international is international humanitarian law? The Laws of Yesterday's Wars 2: From Ancient India to East Africa, together with its companion volume, The Laws of Yesterday’s Wars: From Indigenous Australians to the American Civil War (Brill-Nijhoff, 2021), attempts to answer that question. It offers a culture-by-culture account of various unique restrictions placed on warfare over time. Containing essays by a range of laws of war academics and practitioners, it approaches the laws of yesterday’s wars from a wide cross-section of history and culture, seeking to find any common ground and to demonstrate a history of international law outside the usual confines of its ‘development’ by Europeans and its later ‘contributions.’ This volume includes studies on Japanese, Islamic and Eastern Native American rules of war.