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It took the U.S. Army a full two years after the attack on Pearl Harbor to break the codes of the Japanese Imperial Army. But by 1944 the U.S. was decoding more than 20,000 messages a month filled with information about enemy movements, strategy, fortifications, troop strengths, and supply convoys.
In MacArthur's ULTRA, historian Edward Drea recounts the story behind the Army's painstaking decryption operation and its dramatic breakthrough. He demonstrates how ULTRA (intelligence from decrypted Japanese radio communications) shaped MacArthur's operations in New Guinea and the Philippines and its effect on the outcome of World War II.
From sources on both sides of the Pacific and national security agency declassified records, Drea has compiled a detailed listing of the ULTRA intelligence available to MacArthur. By correlating the existing intelligence with MacArthur's operational decisions, Drea shows how MacArthur usedand misusedintelligence information. He tells for the first time the story behind MacArthur's bold leap to Hollandia in 1944 and shows how ULTRA revealed the massive Japanese mobilization for what might have been (had it occurred) the bloodiest and most protracted engagement of the entire war the Allied invasion of Japan. Drea also clarifies the role of ULTRA in Truman's decision to drop atomic bombs on Japan in 1945, and concludes that ULTRA shortened the war by six to ten months.
1. MacArthur's Codebreaking Organization
2. ULTRA's Trials and Errors, 1942
3. Breaking into the Japanese Army Codes, January 1943 - January 1944
4. ULTRA's Great Victory: The Hollandia Operation, January - April 1944
5. Misreading ULTRA, May - September 1944
6. The Missing Division: Leyte, 1944
7. The Numbers Game: Luzon, January - June 1945
8. ULTRA as Seer: Uncovering Japanese Plans for Homeland Defense, June - August 1945
A Note on Sources