MacArthur's ULTRA: Codebreaking and the War against Japan, 1942-1945 (Modern War Studies) - Softcover

Drea, Edward J.

Softcover

ISBN 10: 0700605762 ISBN 13: 9780700605767

Publisher: University Press of Kansas, 1991

Synopsis

Cracking the enemy's radio code is a task so urgent and so difficult that it demands the military's best minds and most sophisticated technology. But when the coded messages are in a language as complex as Japanese, decoding problems multiply dramatically.

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.

About this title

From the Back Cover

In this book, the author assesses the relationship between special intelligence and the campaigns of General Douglas MacArthur in the Pacific. During World War II, special intelligence, commonly referred to as ULTRA today, meant information obtained through monitoring, intercepting, and decoding enemy radio communications.

About the Author

Edward J. Drea is chief of the Research and Analysis Division at the U.S. Army Center of Military History in Washington, D.C., and author of The 1942 Japanese General Election. He is fluent in Japanese.

Edition details

• Publisher: University Press of Kansas
• Publication date: 1991
• ISBN 10: 0700605762
• ISBN 13: 9780700605767
• Binding: Paperback
• Language: English
• Number of pages: 312