In 1917, British Intelligence intercepted a diplomatic telegram between Germany and Mexico. The contents of the telegram contained information that had the potential to change the course of the first World War. Not only was it an important turning point in World War I, but it was also one of the first successful signal intelligence operations in world history. Learn more about the Zimmerman Telegram on this episode of Everything Everywhere Daily.
Learn more about your ad choices. Visit megaphone.fm/adchoices)
