Book excerpt: A military intelligence expert examines the most formative battle of World War II. The Battle of Normandy was the greatest offensive campaign the world had ever seen. Millions of soldiers battling for control of Europe were thrust onto the front lines of a massive war unlike any experienced in history. But the greatest of clashes would prove to be the crucible in which the outcome of World War II would be decided. Author John Prados tells the story of how and why the tactics and battle plans of Normandy proved so formative, and reconstructs the climactic Allied Normandy breakout from both sides of the battle lines.