National Military Park, National Battlefield, National Battlefield Park, and National Battlefield Site are four designations for 25 battle sites preserved by the United States federal government because of their national importance. The designation applies to "sites where historic battles were fought on American soil during the armed conflicts that shaped the growth and development of the United States...."

Big Hole National Battlefield preserves a battlefield in the western United States, located in Beaverhead County, Montana. In 1877, the Nez Perce fought a delaying action against the U.S. Army's 7th Infantry Regiment here on August 9 and 10, during their failed attempt to escape to Canada. This action, the Battle of the Big Hole, was the largest battle fought between the Nez Perce and U.S. Government forces in the five-month conflict known as the Nez Perce War.