The Conquest of Middle Peru
Hastu-huaraca, who had been commissioned by the allied tribesmen of Chinchay-suyu to reduce the Incas, now threw in his lot with them, and together conqueror and conquered proceeded to the liberation of the district of Chinchay-suyu from the tyranny of the Huanca alliance. The reduction of the southern portion of that territory was speedily accomplished. In the valley of Xauxa the invaders came upon the army of the Huanca, on which they inflicted a final defeat. The Inca spared and liberated the prisoners of war, who were numerous. Once more, at Tarma, were the Huanca beaten, after which all resistance appears to have been overcome. The city-state of Cuzco was now the dominant power throughout the whole of Central Peru, a territory 300 miles in length, whilst it exercised a kind of suzerainty over a district of equal extent toward the south-east, which it shortly converted into actual dominion.