The Horsehead Trail — John Dyson

When Charlie Goodnight leaves the Texas Rangers all he wants is to raise enough cash to marry his girlfriend. He's got a herd of longhorns to sell, but instead of driving them north to Kansas, he heads south-west into a land no white man has ever taken a herd before. They tell him he is crazy. This is dangerous Comanche country and he will have to blaze a trail across a waterless desert. The odds are all against him. But only time will tell...