.. for the Americans because they had a great deciphering man in Friedman.
Friedman’s group of mathematicians and intelligence was called the Magicians.  Throughout the war they helped decipher many Japanese originated messages that were critical military moves.  One of the greatest moves Friedman made was in the interception of the fortifications of Normandy, which made D-Day possible. His efforts led to the creation of a counterpart of PURPLE that allowed the USA to decipher its’ messages.  The Magicians and Friedman played a major role in making the defeat of Japan and Germany possible by deciphering messages and creating counterparts to cipher machines.
Another help that USA Espionage did in the war was because it could show evidence of military moves. One of the greatest moves it foretold was that Germany was going to attack Russia. [Richelson, 113] It was recorded that Foreign Secretary Anthony Eden summoned Maisky, an Ambassador of resent German redeployments of forces towards Russian and informed him of this: In the past forty-eight hours the information reaching us had become more significant.The troop concentrations might be for the purpose of a war of nerves, or they might be for the purpose of an attack on Russia . . . but we were bound to consider in the light of this very formidable build-up, that conflict between Germany and Russia was possible.
 Of course there was an attack on Russia by Germany, but the Soviets were not completely unprepared thanks to our intelligence’s work. Our spies had a work as great as the troops that fought in the war, because they also put themselves on the line in the other countries to support the war behind the scenes. Their contributions helped the US in preparing other countries for attacks that would soon after ally themselves with them. The attack on Pearl Harbor was a major part of the war. Although intelligence helped maintain our strength in the war, its’ mistakes helped us make it into the war. Intelligence historian David Kahn observed this: “Intelligence officers could have perhaps have foreseen the attack if the United States, years before, had instituted spies into high level Japanese military and naval circles, flown regular aerial reconnaissance of the Japanese navy, put intercept units aboard ships sailing close to Japan to pick up naval messages hat greatly expanded codebreaking unit might have cracked.
.. . The intelligence failure at Pearl Harbor was not one of analysis but of collection.
”  Although it was not necessarily a mistake, the attack, according to Historian David Kahn could have been either known of or prevented.  Some of the various information that was critical for the US to acquire was provided by their counterspies.  These spies were used as agents against those who stole information that would help the Axis in their wins, just as the USA used their own Espionage to their advantage so would their enemies.
Keeping their information was a critical point so that Germany was not able to know that the Allied Powers knew of their plans. Some of the transmitting had to stop because of the danger of counterspies. Unfortunately for the Axis, the US continued to work throughout the hostility of counterspies and had success.
[Johnson, 123] One critical part of intelligence was to keep the atomic bomb a secret. [Richelson, 134] Not only from the Axis, but Russia was trying to spy on the US’s attempts as well. [134, 135] The FBI and the CIA did much work in the defeat of these spies by arresting them, searching houses for documents and such.  This part of the US Espionage was critical for if the Atomic bombs plan were wrecked the war could’ve gone on longer, or if the technology had fallen into the hands of the Axis the war could have turned into a different scenario.Throughout many different other battles the US had information on various military movements of the Axis because of the share of there information with the British. [O’Toole, 392] British intelligence had some information the US did not have against the Axis which proved very useful against their enemies.  British intelligence became of much use to the US throughout the world war and they intern continue to give there espionage information to them as well.
This boded for a greater advancement in espionage because each of the countries best combined for great possibilities in that field.  Again, when USA intelligence ran into some trouble they continue to help with their efforts in winning the war by sharing and receiving information from the British. Perhaps the greatest contributions of the espionage in the USA were when the assault on D-Day took place.A plan finally arose after many days of scheming. [Richelson, 154] It was called JEDBURGH.  The plan basically took many three manned teams that would infiltrate the area once the invasion began and started to gather intelligence, while others linked up with the masquisards.  They then continued to tell of German military movements, decipher intercepted messages and told airplanes where to drop the weapons that were needed to upend the German defense plans.
 Additional sabotage operations forced Germans to communicate by radio and they became easier to intercept and decipher.  Espionage was needed to make this monumental assault a success for the Allies. During the war, the spies continued there hiding, while the Germans began to seek them.Americans came out with the upper end in the war. Espionage helped prepare defenses, win battles, and warn other allied powers of attacks of the Axis.
On all accounts it seems that the USA could not have won the war without the help of their Espionage. Whether it be deciphering messages, recording military movements, or finding other spies, American espionage played a major role in the defeat of Germany and their allies during World War II. American Espionage stood up to the dangers that a soldier faced in battle and did not back down when their country needed them, even if it meant dying to keep a secret. Bibliography BIBLIOGRAPHY Richelson, Jeffrey.
A Century of Spies Intelligence in the Twentieth Century. Oxford University Press, 1995. O’Toole, G. J. A. Honorable Treachery A History of U.S. Intelligence, Espionage, and Covert Action From the American Revolution to the CIA.
New York: Atlantic Monthly Press, 1991.Volkman, Ernest. Espionage The greatest Spy Operations of the 20th Century. John Wiley & Sons, Inc.
, 1995. Johnson, Loch K. Secret Agencies.
Yale University, 1996. History Essays.