Just days after the chaotic Battle of Normandy broke out in June 1944, a critically important radio message rang out across Allied airwaves: “Five miles to the right of the designated area and five miles inland, the fighting is fierce and we need help.” This in itself was not an unusual wartime message, but unlike others it was not conveyed in English, French, or even intercepted German. It was relayed in the Native American language of Comanche, as part of an operation that would help save the lives of thousands of American and Allied personnel.