Fernando de Alva Cortés Ixtlilxochitl wrote an account from the pov of his grandfather (maybe great grand father, on mobile now and can't remember) prince Ixtlilxochitl (http://www.amazon.com/The-Native-Conquistador-Ixtlilxochitls-Originals/dp/0271066857)
Prince Back Flower (my loose translation of Ixtlilxochitl) fought with Cortes against the triple alliance and did so for damn good reasons. Motecuzoma had just recently unjustly stripped him of his presumed birth rite to rule Tezcoco and installed his half wit cousin in order to better control that branch of the alliance.
If memory serves (sadly rarely does) he gave the more than competant Ixtlilxochitl and his personal army the provincial eastern side of the Tezcoco territory, as luck would have it, the side that the invaders were coming from on their way into the lake valley, whoops!
At the tragic end to it all, Tenochtitlan that is, Black Flower got a title i think and was also given a spot in the new Spanish administration of the ruins and rebuilding of the city, I'm sure Mexicans love him about as much as they love Dona Marina, or as they pejoratively call her, Malinche.
This is a gross oversimplification of the situation, but a decent place to start if you're interested in knowing more.