For hundreds of years, wars have played a determining role in history and have decided the rise and fall of civilizations. Many believe that understanding the causes and consequences of warfare may move humankind towards world peace. This selection of the 50 most consequential wars, compiled by award-winning military historian Spencer C. Tucker, presents each conflict in chronological order and discusses its causes, its course, and its significance in world history.

Through thoughtful essays and supporting visual evidence, this reference work examines the types of weapons systems employed and their effects in the field; the roles played by individual leaders such as Alexander the Great, Julius Caesar, Abraham Lincoln, and Adolf Hitler; and the impact of geography and economics on the battlefield. The work includes fascinating information about warfare, addressing subjects such as how transportation and logistics changed the face of war over time, what invention marked the ascendancy of infantry over cavalry, why World War I remains the most important war in the 20th century, and which war killed nearly half of the population of Germany. Each essay includes the latest interpretations of strategy, agendas, and consequences of the featured event.