For the British, the demise of their horsed cavalry was even worse, for the problem could have been solved by replacing two blockheaded General Officers.
Not just the existence of the horse, but the exact hardy type, and moreover, the way the plains people learned from the horse, not from the Spanish, what gaits were best suited to their way of life.
Pryor bought 40 horses, of which 10 escaped and the rest were stolen by the Crow tribe, who still have their descendants.