Having assembled about an hundred and fifty soldiers, Giron assumed the office of commander-in-chief of the army of liberty, appointing Diego de Alvarado the lawyer his lieutenant-general; Thomas Vasquez, Francisco Nunnez, and Rodrigo de Pineda captains of horse; the two last of whom accepted more from fear than affection.  Juan de Pedrahita, Nuno Mendiola, and Diego Gavilan were made captains of foot; Albertos de Ordunna standard-bearer, and Antonio Carillo serjeant-major; all of whom were ordered to raise soldiers to complete their companies with every possible expedition.  It being reported through the country that the whole citizens of Cuzco had concurred in this rebellion, the cities of Guamanga and Arequipa sent deputies to Cuzco, desiring to be admitted into the league, that they might jointly represent to his majesty the burdensome and oppressive nature of the ordinances imposed by the judges in relation to the services of the Indians.  But when the citizens of Guamanga and Arequipa became rightly informed that this rebellion, instead of being the act of the Cabildo and all the inhabitants, had been brought about by the contrivance of a single individual, they changed their resolutions, and prepared to serve his majesty.  About this time, the arch rebel Giron caused the deposed governor, Gil Ramirez, to betaken from prison and escorted forty leagues on his way towards Arequipa, and then set free.

Fifteen days after the commencement of the rebellion, finding himself at the head of a considerable force, he summoned a meeting of all the citizens remaining in Cuzco, at which there appeared twenty-five citizens who were lords of Indians, only three of whom were intitled from office to sit in that assembly.  By this meeting, Giron caused himself to be elected procurator, captain-general, and chief-justice of Peru, with full power to govern and protect the whole kingdom both in war and peace.  When news of this rebellion was brought to Lima by Hernando Chacon, who was foster-brother to Giron, the judges would not credit the intelligence, believing it only a false report, to try how the people stood affected to the cause, and therefore ordered Chacon to be imprisoned; but learning the truth soon afterwards, he was set at liberty, and the judges began seriously to provide for suppressing the rebellion, appointing officers and commanders to raise forces for that purpose.  They accordingly sent a commission to Alonzo de Alvarado, then at La Plata, constituting him captain-general of the royal army against Giron, with unlimited power to use the public treasure, and to borrow money for the service of the war in case the exchequer should fail to supply sufficient for the purpose.  Alvarado accordingly appointed such officers as he thought proper to serve under him, and gave orders to raise men, and to provide arms and ammunition for the war.