Big Hole National Battlefield preserves a Nez Perce War battlefield located in Montana, United States. The Nez Percé fought a delaying action against the 7th Infantry Regiment (United States) here on August 9 and 10, 1877, during their failed attempt to escape to Canada. This action, the Battle of the Big Hole, was the largest battle fought between the Nez Percé and U.S. Government forces in the five-month conflict known as the Nez Perce War. In 1992 the park was made a part of Nez Perce National Historical Park, which consists of 38 separate locations in five different states, following the flight of the Nez Percé tribe from the U.S. Cavalry.