Combined Fleet Decoded - The Secret History of American Intelligence and the Japanese Navy I WWII

Author: John Prados
Publisher: Random House New York
Edition: First
Cover: Hardcover w/Dust Cover
ISBN: 0-679-43701-0
Navy
The most authoritative and revealing examination yet of the way intelligence--of all kinds--was instrumental in defeating Japan

More Reference Books

Synopsis: John Prados's groundbreaking study reveals how American codebreaking operations provided crucial intelligence about Japanese naval aviation and fleet operations throughout the Pacific War, examining the decisive role of signals intelligence in achieving Allied victory. This comprehensive analysis shows how American cryptographers and intelligence analysts penetrated Japanese military communications, providing strategic and tactical advantages that proved decisive in major naval battles. Prados documents the evolution of American codebreaking capabilities, showing how prewar efforts to understand Japanese diplomatic and military communications provided the foundation for wartime intelligence successes. The book examines the organization and personnel of American intelligence operations, from the Navy's cryptographic units to the coordination with British and other Allied intelligence services. The author analyzes specific intelligence breakthroughs, including the penetration of Japanese naval codes that revealed enemy fleet movements, battle plans, and strategic intentions. The work chronicles how intelligence gathering supported major operations, from the Doolittle Raid's planning to the decisive victory at Midway that was enabled by advance knowledge of Japanese intentions. Prados examines the challenges of protecting intelligence sources while using the information effectively, showing how operational security considerations affected the employment of signals intelligence. The book documents the role of intelligence in supporting submarine warfare, showing how code-breaking enabled American submarines to intercept Japanese merchant vessels and naval units. The author analyzes the impact of intelligence on carrier operations, examining how advance warning of enemy movements and intentions affected air operations and fleet positioning. The work explores the evolution of Japanese communications security and how enemy countermeasures forced continuous adaptation of American intelligence techniques. Prados documents the coordination between intelligence gathering and operational planning, showing how cryptographic information influenced strategic decision-making at the highest levels. The book examines the role of intelligence in the final phase of the Pacific War, including support for the strategic bombing campaign and preparation for the planned invasion of Japan. The author analyzes the post-war assessment of intelligence effectiveness, examining how signals intelligence contributed to the speed and decisiveness of American victory in the Pacific. The work explores the technological aspects of codebreaking, showing how advances in communication interception and analysis capabilities enhanced intelligence gathering throughout the war. Prados examines the human dimension of intelligence operations, documenting the dedication and skill of personnel who worked under intense pressure to provide timely and accurate information. The book analyzes the broader implications of intelligence success, showing how superior information gathering capabilities provided strategic advantages that compensated for initial material disadvantages. Through extensive research and careful analysis, the author demonstrates how intelligence operations provided the foundation for tactical and strategic success, revealing a crucial but previously hidden dimension of the Pacific War that contributed decisively to Allied victory.

Combined Fleet Decoded - The Secret History of American Intelligence and the Japanese Navy I WWII, is one of the many primary source materials in the Army Air Corps Museum collection.