The Prairie D'Âne Battlefield, also known as Prairie D'Ann Battlefield or Prairie De Ann Battlefield in anglicized forms, was the site of the Civil War Battle of Prairie d'Âne, one of the engagements in southwestern Arkansas of the Union's Camden Expedition of 1864. It was listed on the National Register of Historic Places in 1974, and, with other sites, is part of the Camden Expedition Sites National Historic Landmark. It was declared part of the National Historic Landmark in 1994.