Editing Roger Mills County, Oklahoma (section)

==History==
Roger Mills County takes its name from [[Roger Q. Mills]], an officer in the Confederate States Army during the [[American Civil War]] and later senator from [[Texas]].<ref name=WilsonLD-OHS-EofOH&C/><ref>[http://digital.library.okstate.edu/chronicles/v002/v002p075.html "Origin of County Names in Oklahoma." ''Chronicles of Oklahoma''.] Volume 2, Number 1. March 1924.</ref> The town of [[Cheyenne, Oklahoma|Cheyenne]] in Roger Mills County is the location of the [[Battle of Washita River]] (also called Battle of the Washita; Washita Battlefield and the Washita Massacre), where [[George Armstrong Custer]]’s [[U.S. 7th Cavalry Regiment|7th U.S. Cavalry]] attacked Chief [[Black Kettle]]’s [[Cheyenne]] village on the [[Washita River]] on November 26, 1868.<ref>[http://www.nps.gov/waba/ Washita Battlefield National Historic Site]. — [[National Park Service]].</ref>

The area covered by Roger Mills County had been part of the [[Cheyenne and Arapaho Tribes|Cheyenne Arapaho]] reservation until after [[Oklahoma Territory]] was created and County E was formed. County E was renamed [[Day County, Oklahoma Territory|Day County]]. Day County was abolished and Roger Mills County was created at statehood on November 16, 1907. The county's western boundary with Texas was moved eastward {{convert|3800|ft|m}} when the Supreme Court ruled that the 100th Meridian was farther east than originally supposed.<ref name=WilsonLD-OHS-EofOH&C/>

During the 1970s, Roger Mills County and the surrounding area were the site of [[natural gas]] and [[Petroleum|oil]] development in the Panhandle-[[Hugoton Gas Field]], the largest-volume gas field in the United States, and the world's largest known source of [[helium]]. Between 1973 and 1993, the field produced over 8 trillion cubic feet (230,000,000 m<sup>3</sup>) of natural gas.