War, Peace and International Relations provides an introduction to the strategic history of the past two centuries, showing how those 200 years were shaped and reshaped extensively by war. The book takes a broad view of what was relevant to the causes, courses, and consequences of wars. Written by leading strategist Professor Colin Gray, the book provides students with a good grounding in the contribution of war to the development of the modern world, from the pre-industrial era to the age of international terrorism and smart weapons. This second edition has been thoroughly revised and updated: It is the first one-volume strategic history textbook on the market; It covers all the major wars of the past two centuries; It is up to date and comprehensive, including a new section on the American Civil War, a new chapter on geography and strategy, and completely rewritten chapters on Iraq and Afghanistan in the 2000s and on irregular warfare. This textbook will be essential reading for students of strategic studies, security studies, war studies, international relations and international history.