The Chichimec Exodus
Meanwhile the rude Chichimecs of the north, who had for many years carried on a constant warfare with the Toltecs, were surprised that their enemies sought their borders no more, a practice which they had engaged in principally for the purpose of obtaining captives for sacrifice. In order to discover the reason for this suspicious quiet they sent out spies into Toltec territory, who returned with the amazing news that the Toltec domain for a distance of six hundred miles from the Chichimec frontier was a desert, the towns ruined and empty and their inhabitants scattered. Xolotl, the Chichimec king, summoned his chieftains to his capital, and, acquainting them with what the spies had said, proposed an expedition for the purpose of annexing the abandoned land. No less than 3,202,000 people composed this migration, and only 1,600,000 remained in the Chichimec territory.
The Chichimecs occupied most of the ruined cities, many of which they rebuilt. Those Toltecs who remained became peaceful subjects, and through their knowledge of commerce and handicrafts amassed considerable wealth. A tribute was, however, demanded from them, which was peremptorily refused by Nauhyotl, the Toltec ruler of Colhuacan; but he was defeated and slain, and the Chichimec rule was at last supreme.