The Salitre War (Spanish: Guerra del Salitre; also Saltpeter War) was a 1480-1510 military conflict between the Tarascan state of Purépecha people and peoples settled in Colima, Sayula, Zapotlán, Tapalpa and Autlán. It started with the invasion of Tarascan cazonci (monarch) Tangaxuan II with the purpose to seize the mining of saltpeter (hence the name) and ended with the expulsion of Purépecha from the areas of Colima and Jalisco.
References
Saltpeter War (Mexico) Wikipedia(Text) CC BY-SA