At the foot of the Huachuca Mountains, the U.S. Army founded one of the most crucial military posts for American expansion into the southwest frontier. Soldiers had been stationed in the region for decades, but in 1877 Fort Huachuca became the symbolic cornerstone of America's western domain. The Native American word huachuca, meaning "place of thunder," described the sporadic but marvelous electrical storms in the area, but the skies would not be...