During the Geronimo expeditions in the 1880s General Nelson Miles devised a system of "heliographs" (mirror signals from mountain peak to mountain peak) to try and coordinate efforts against Geronimo. The heliographs were an interesting, but never very useful experiment. One heliograph was placed at Fort Bowie, about 100 miles south of Signal Peak. Another heliograph was placed at Heliograph Peak in the Graham Mountains, near Safford. The Signal Peak heliograph could communicate with the Graham Mountain heliograph and the Aztec Peak heliograph in the Sierra Anchas, north of Globe. The Aztec Peak heliograph, by a series of other mountain peaks, could communicate all the way to Camp Verde, near what is now Sedona, Arizona. Anyway, the entire system could be used to communicate from El Paso, Texas, to Camp Verde, Arizona. Signal Peak was one of the primary links.