The German attack on merchant shipping in the Second World War, known as the Battle of the Atlantic, was countered partly by code-breaking intelligence known as Ultra. The dramatic revelation of this factor in the middle 1970s resulted in many works giving this as the most important cause of Allied success.

SIGNALS INTELLIGENCE, or SIGINT, is the interception and evaluation of coded enemy messages. From Enigma to Ultra, Purple to Lorenz, Room 40 to Bletchley, SIGINT has been instrumental in both victory and defeat during the First and Second World War.In the First World War, a vast network of signals rapidly expanded across the globe, spawning a new breed of spies and intelligence operatives to code, de-code and analyse thousands of messages. As a result, signallers and cryptographers in the Admiralty’s famous Room 40 paved the way for the code breakers of Bletchley Park in the Second World War. In the ensuing war years the world battled against a web of signals intelligence that gave birth to Enigma and Ultra, and saw agents from Britain, France, Germany, Russia, America and Japan race to outwit each other through infinitely complex codes. For the first time, Peter Matthews reveals the secret history of global signals intelligence during the world wars through original interviews with German interceptors, British code breakers, and US and Russian cryptographers."SIGINT is a fascinating account of what Allied investigators learned postwar about the Nazi equivalent of Bletchley Park. Turns out, 60,000 crptographers, analysts and linguists achieved considerable success in solving intercepted traffic, and even broke the Swiss Enigma! Based on recently declassifed NSA document, this is a great contribution to the literature." THE ST ERMIN'S HOTEL INTELLIGENCE BOOK OF THE YEAR AWARD 2014.

This book contains the U-boats situations and trends written by the staff of the Admiralty’s Operational Intelligence Centre during the Second World War. Based largely on communications intelligence, the U-boat situations and trends were designed to inform a small number of senior officers and high officials of the latest events and developments in the Allied war against the U-boats. The Battle of the Atlantic and the war against the U-boats was the longest and the most complex naval battle in history. In this huge conflict which sprawled across the oceans of the world the U-boats sank 2,828 Allied merchant ships while the Allies destroyed more than 780 German U-boats. These documents relate on a weekly, and in some cases a daily, basis exactly what the Allies knew concerning the activities of the U-boats during the Battle of the Atlantic.

This book contains the U-boats situations and trends written by the staff of the Admiralty's Operational Intelligence Centre during the Second World War. Based largely on communications intelligence, the U-boat situations and trends were designed to inform a small number of senior officers and high officials of the latest events and developments in the Allied war against the U-boats. The Battle of the Atlantic and the war against the U-boats was the longest and the most complex naval battle in history. In this huge conflict which sprawled across the oceans of the world the U-boats sank 2,828 Allied merchant ships while the Allies destroyed more than 780 German U-boats. These documents relate on a weekly, and in some cases a daily, basis exactly what the Allies knew concerning the activities of the U-boats during the Battle of the Atlantic.

These documents relate on a weekly, and in some cases a daily, basis exactly what the Allies knew concerning the activities of the U-boats during the Battle of the Atlantic.

A masterly look at the value and limitations of intelligence in the conduct of war from the premier military historian of our time, John Keegan. Intelligence gathering is an immensely complicated and vulnerable endeavor. And it often fails. Until the invention of the telegraph and radio, information often traveled no faster than a horse could ride, yet intelligence helped defeat Napoleon. In the twentieth century, photo analysts didn’t recognize Germany’s V-2 rockets for what they were; on the other hand, intelligence helped lead to victory over the Japanese at Midway. In Intelligence in War, John Keegan illustrates that only when paired with force has military intelligence been an effective tool, as it may one day be in besting al-Qaeda.

The Oxford Handbook of War is the definitive analysis of war in the twenty-first century. With over forty senior authors from academia, government and the armed forces world-wide the Handbook explores the history, theory, ethics and practice of war. The Handbook first considers the fundamental causes of war, before reflecting on the moral and legal aspects of war. Theories on the practice of war lead into an analysis of the strategic conduct of war and non Western ways of war. The heart of the Handbook is a compelling analysis of the military conduct of war which is juxtaposed with consideration of technology, economy, industry, and war. In conclusion the volume looks to the future of this apparently perennial feature of human interaction.

U.S. Navy Intelligence Contribution Key to SE Asia War Effort from 1965-75 Knowing the Enemy, part of the commemorative series The U.S. Navy and the Vietnam War, covers the Navy intelligence establishment's support to the war effort in Southeast Asia from 1965 to 1975. It describes the contribution of naval intelligence to key strategic, operational, and tactical aspects of the war including the involvement of intelligence in the seminal Tonkin Gulf Crisis of 1964 and the Rolling Thunder and Linebacker bombing campaigns; the monitoring of Sino-Soviet bloc military assistance to Hanoi; the operation of the Seventh Fleet's reconnaissance aircraft; the enemy's use of the "neutral" Cambodian port of Sihanoukvil≤ and the support to U.S. Navy riverine operations during the Tet Offensive and the SEALORDS campaign in South Vietnam. Special features elaborate on the experiences of reconnaissance plane pilots navigating the dangerous skies of Indochina; intelligence professionals who braved enemy attacks at shore bases in South Vietnam; the perilous mission in Laos of Observation Squadron 67 (VO-67); the secret voyage of nuclear attack submarine Sculpin (SSN-590); and the leadership and heroism of Captain Earl F. Rectanus, Lieutenant Commander Jack Graf, and other naval intelligence professionals who risked, and sometimes lost, their lives in the service of their country during the war. The work is lavishly illustrated with more than 85 photographs and maps, and includes a select list of suggested readings. This publication will be of interest and value to scholars, veterans, and students of the Vietnam War and the Navy's role in that conflict. Related products: Vietnam War resources collection can be found here: https://bookstore.gpo.gov/catalog/us-military-history/battles-wars/vietnam-war Other products producted by the U.S. Navy, Naval History and Heritage Command can be found here: https://bookstore.gpo.gov/agency/902

Originally printed during WWII by the Commander of Submarines, Atlantic Fleet, ¿Submarine Phraseology¿ was standard issue for sailors serving in the Silent Service. The first section of the book puts forth general rules for formulating messages, with an emphasis on creating uniform voice procedures. The second part of the text covers specific forms of phraseology used in various operations. Whether you¿re a submarine fleet veteran, a museum docent, a fan of submarine history, or a screenwriter who wants to create historically accurate dialogue, this book makes a great addition to any submarine library.

Operational Intelligence Centre was the nerve centre of the British Admiralty in World War II, dedicated to collecting, analyzing and disseminating information from every possible source which could throw light on the intentions and movements of German naval and maritime forces. OIC labored tirelessly, despite early disappointments, to supply the Navy and RAF with the intelligence that would enable them to defeat Hitler and his admirals. Patrick Beesly, an insider drawing on considerable personal knowledge, reveals, in full, the compelling story of OIC. He throws light on dramatic episodes such as the hunt for the Bismarck; the tragedy of Convoy PQ17; the long war against the U-boats; and on many other significant events critical to the course of the war. Very Special Intelligence, here presented with a new Introduction which sets the work in context and takes account of new research, is the fascinating story of an organization which contributed so much to Allied success.