The Allied military’s tactical movements were jeopardized by the German military’s superior espionage capabilities. Not only were the Germans tapping Allied phone lines, they were able to crack the code. That’s when two Native American soldiers speaking Choctaw came in, and would ultimately help turn the tide of the war. After a chance encounter with an officer, they were charged with setting up a new kind of communications system, one that required ingenuity and made heroes out of an oppressed group of Native Americans.
There is a great movie on this topic called Windtalkers, fyi.
I remember hearing that the same strategy was used in the South Pacific during WWII to prevent the Japanese military from tapping into the US military's radio signals.