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The Zimmermann telegram (or Zimmermann note or Zimmermann cable) was a secret diplomatic communication issued from the German Foreign Office on January 17, 1917, that proposed a military contract between the German Empire and Mexico if the United States entered World War I against Germany.
Rev. William Montgomery (1871–1930) was a Presbyterian minister and a British codebreaker who worked in Room 40 during World War I.. Montgomery and Nigel de Grey deciphered the Zimmermann Telegram, which helped bring the U.S. into World War I.
In January 1917, British agents intercepted a telegram sent to German Ambassador to Mexico Heinrich von Eckardt by Arthur Zimmermann, State Secretary for Foreign Affairs of the German Empire. In the telegram, Germany proposed to Mexico that if the United States were to join the war, Mexico should join and side with the Central Powers.
The decoding by British Naval intelligence of the Zimmermann telegram helped bring the United States into the war. Trench codes were used by field armies of most of the combatants (Americans, British, French, German) in World War I. [1] The most commonly used codes were simple substitution ciphers. More important messages generally used ...
In the telegram's plaintext, Nigel de Grey and William Montgomery learned of German Foreign Minister Arthur Zimmermann's offer to Mexico of United States' territories of Arizona, New Mexico, and Texas as an enticement to join the war as a German ally. The telegram was passed to the U.S. by Captain Hall, and a scheme was devised (involving a ...
Alfred Dillwyn "Dilly" Knox, CMG (23 July 1884 – 27 February 1943) was an English classics scholar and papyrologist at King's College, Cambridge and a codebreaker.As a member of the Room 40 codebreaking unit he helped decrypt the Zimmermann Telegram which brought the USA into the First World War. [1]
Admiral Sir William Reginald Hall KCMG CB (28 June 1870 – 22 October 1943), known as Blinker Hall, was the British Director of Naval Intelligence (DNI) from 1914 to 1919. . Together with Sir Alfred Ewing he was responsible for the establishment of the Royal Navy's codebreaking operation, Room 40, which decoded the Zimmermann telegram, a major factor in the entry of the United States into ...
Eckardt is known for being the recipient of the Zimmermann Telegram, a telegram sent by German Foreign Secretary Arthur Zimmermann on January 16, 1917. The message was first sent to the German ambassador to the United States, Johann von Bernstorff, to deter interception, and he relayed it to Eckardt on January 19.