![]() By 1917, British Intelligence could decipher most German messages. Room 40 also received a copy of the German diplomatic code, stolen from a German diplomat’s luggage in the Near East. The Zimmermann telegram was a coded note sent by Germanys Foreign Minister, Arthur Zimmermann, in January 1917 with a message for the Mexican government. In October of 1914, the Russian admiralty gave British Naval Intelligence (known as Room 40) a copy of the German naval codebook removed from a drowned German sailor’s body from the cruiser SMS Magdeburg. The Zimmermann Telegram was a 1917 coded message from the Foreign Secretary of the German Empire, Arthur Zimmermann to the German Minister to Mexico. As Germany lacked a direct telegraph line to North America, the Zimmermann Telegram was transmitted over American and British lines. Britain began capturing large volumes of intelligence communications.īritish code breakers worked to decrypt communication codes. In January 1917, British naval intelligence intercepted what became the. Included: the cracking of an encoded telegram from the German foreign minister to the president of. Soon after the war began, the British successfully tapped into overseas cable lines Germany borrowed from neutral countries to send communications. The Zimmermann Telegram: Intelligence, Diplomacy, and Americas Entry into World War I. The telegram was considered perhaps Britains greatest. In 1914, with war imminent, the British had quickly dispatched a ship to cut Germany’s five trans-Atlantic cables and six underwater cables running between Britain and Germany. The Zimmermann Telegram galvanized American public opinion against Germany once and for all. The secret to the British interception began years earlier. ![]() ![]() Months earlier, British intelligence had intercepted a secret message from German Foreign Minister Arthur Zimmermann to the Mexican government, inviting an alliance (along with Japan) that would recover the southwestern states Mexico lost to the U.S. ![]() On March 1, 1917, the American public learned about a German proposal to ally with Mexico if the United States entered the war. In January 1917, the British intercepted a coded telegram from German foreign secretary Arthur Zimmermann to Germanys ambassador to Mexico that offered to. ![]()
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