CHAPTER VI.--Retreat to Otumba--Cortéz is encountered by a new
army of Aztecs and auxiliaries--Victory of the Spaniards at Otumba--Proposed re-alliance of Aztecs and Tlascalans--Forays of Cortéz--reduction of the eastern regions--Cortéz proposes the reconquest--sends off the disaffected--Cortéz settles the Tlascalan succession, 50