The Viceroy Antonio de Mendoza called upon the experienced conquistador Pedro de Alvarado to assist in putting down the revolt. Alvarado declined to await reinforcements and attacked Mixton in June 1541 with four hundred Spaniards and an unknown number of indigenous allies.[9] He was met there by an estimated 15,000 natives under Tenamaztle and Don Diego, a Zacateco. The first attack of the Spanish was repulsed with ten Spaniards and many indigenous allies killed.