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内容説明
It took the US army two full years after the attack on Pearl Harbour to break the radio codes of the Japanese Imperial Army. But by 1944， the US 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 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. By correlating the existing intelligence with MacArthur’s operational decisions， Drea shows how MacArthur used - and misused - intelligence information. He also clarifies the role of ULTRA in Truman’s decision to drop atomic bombs on Japan in 1945， and examines the role of ULTRA on the outcome of World War II.
From Publishers Weekly
The acronym ?ULTRA，? as employed here， refers to special intelligence derived from the interception and decryption of Japanese radio traffic and its use by Gen. Douglas MacArthur in his New Guinea and Philippines campaigns. Drea’s excellent study uncovers the motivation behind certain command decisions that have puzzled historians， particularly in regard to the 1944 Hollandia operation in New Guinea. He demonstrates how ULTRA enabled MacArthur to select the weakest point in the enemy’s defenses and then strike with overwhelming superiority. On the other hand， Drea also shows that MacArthur’s use of ULTRA became a ?hit or miss proposition? after Hollandia， and comes to the surprising conclusion that the general did not rely heavily on ULTRA， usually dismissing intelligence that failed to mesh with his preconceived strategic vision. The book presents a detailed illustration of the interplay between intelligence-gathering and operational planning， and uses one of history’s most successful commanders as its model. Drea is chief of the research and analysis division at the Army Center of Military History in Washington， D.C. Photos.
Copyright 1991 Reed Business Information， Inc. --このテキストは、絶版本またはこのタイトルには設定されていない版型に関連付けられています。

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