"Castles, Battles, and Bombs" reconsiders key episodes of military history from the point of view of economics-with dramatically insightful results. For example, when looked at as a question of sheer cost, the building of castles in the High Middle Ages seems almost inevitable: though stunningly expensive, a strong castle was far cheaper to maintain than a standing army. The authors also reexamine the strategic bombing of Germany in World War II and provide new insights into France's decision to develop nuclear weapons. Drawing on these examples and more, Brauer and Van Tuyll suggest...