Of all the Chichimeca natives, the Guachichiles occupied the most extensive territory, stretching north to Saltillo in Coahuila and to the northern corners of Michoacán in the south. Considered both warlike and brave, the Guachichiles roamed through a large section of the Zacatecas, as well as portions of San Luis Potosí, Guanajuato and northeastern Jalisco.
The Guachichiles played a major role in provoking the other Chichimeca tribes to resist the Spanish settlement. The historian Philip Wayne Powell wrote, "Their strategic position in relation to Spanish mines and highways, made them especially effective in raiding and in escape from Spanish reprisal."[1][2]
The Guachichiles were known to paint their bodies, hair, and faces in red dye. For this reason they were called "guachichile" by the Mexica, meaning "heads painted red".
The Guachichil language is now extinct and very little is known about it. It may have been an Uto-Aztecan language closely related to the Huichol language.