Descended from the greatest horses of the American West, the wild horses living on the White Sands Missile Range in New Mexico were national treasures and living legends. But in 1994, after years of suffering through periodic droughts, food shortages, and all the dangers accompanying life on a military weapons-testing site, scores of horses suddenly died. And almost two thousand more were in such dire straits that they were unlikely to survive. Large-animal veterinarian Don Hoglund was called in to organize and lead a team of dedicated cowboys, soldiers, and other professionals in removing...