locomotives soon replaced stage coaches across the United States, and the Butterfield Stage Route was no longer utilized. In 1857, the Battle of Pima Butte was fought in the area of the mountains. The allied Yuma, Mohave, Yavapai and Apache peoples attacked the Maricopa village of Sacate. The Maricopa and their allies, the Akimel O'odham, defeated the attackers, leaving approximately 200 of them dead or wounded. It is notable for being the last major battle fought solely between indigenous Americans in North America. Access Four-wheel-drive vehicles are required to approach the wilderness boundary. Only the western boundary of the wilderness is accessible to the public; elsewhere the wilderness is bounded by the Gila River Indian Reservation. Peaks The major peaks of the Sierra Estrella are (NW to SE): Hayes Peak, , named in honor of Ira Hayes, US Marine hero of the Pima Nation Montezuma Sleeping Butterfly Mountain, Quartz Peak, (usually obscured by Butterfly Mountain when viewed from the east) Montezuma Peak, Montezuma Head The names of the peaks can vary by map. For example, Google Maps lists Hayes Peak as Sierra Estrella High Point and does not name any other peak. See also List of mountain ranges of Arizona List of Arizona Wilderness Areas References External links Estrella Mountain Regional Park Trails at HikeArizona.COM Wilderness areas of Arizona Mountain ranges of the Sonoran Desert Mountain ranges of Maricopa County, Arizona Mountain ranges of Arizona Bureau of Land Management areas in Arizona Protected areas of Maricopa County, Arizona