The Navajo code-talkers in the Second World War are well-known, but not so terribly well known were their brothers the Sioux, and the similar contributions that they had made just twenty years earlier in the Meuse-Argonne Offensive.
Navajo contributions to Battle of the Meusse-ArgonneAmerican Indians in the US Army 1918Native Americans in the US Army WWiAmerican Indians in Great War 1917-18Indian Code-Talkers in World War OneIndian Code Talkers in the First World WarSioux Nation and World War Onewwi US Army CodesHistory of CryptologyJournalism 1917Radio Code Twentieth Century Warfare