(Clavigero, Stor. del Messico, tom. iii. p. 196.) But the Spaniards left Tezcuco May 10th, according to Cortés; and three weeks could not have intervened between their departure and their occupation of Cojohuacan. Clavigero disposes of this difficulty, it is true, by dating the beginning of their march on the 20th instead of the 10th of May; following the chronology of Herrera, instead of that of Cortés. Surely the general is the better authority of the two.