In 1861, Nancy joined the Moccasin Raiders. The Moccasin Raiders were a Confederate guerrilla group led by Perry Conley. Hart became a valuable resource to the Rangers, serving both as a guide and a spy. Hart soon became famous and a problem for the Union forces in West Virgina. In 1862 a reward was offered for information leading to her capture. Soon after Hart and a female friend were captured by union troops under the leadership of Lieutenant Colonel William C. Starr. Hart was taken as a prisoner and held at a camp in Summersville, West Virginia.
A few days later, Hart escaped from the camp on Lt. Col. William C. Starr's horse. Hart joined a regiment of 200 Confederate soldiers led by Major R. Augustus Bailey. A week later the Confederate troops along with Hart, still riding Lt. Col. William C. Starr's horse, overran Summersville. Burning buildings and taking Lt. Col William C. Starr as a prisoner. There is a plaque about Nancy on the Summersville Courthouse lawn in Summersville, West Virginia. After the incident in Summersville, Hart joined the Confederate Army and volunteered to be a spy for General Thomas J. Stonewall Jackson. Harts efforts helped General Jackson's famous Valley Campaign.
After the war, Nancy married a former Ranger, Joshua Douglas. Together they had two sons and lived in Spring Creek and Richwood West Virginia. Nancy died in 1902, she is buried on Manning Knob in Greenbrier County, West Virginia just south of Richwood, West Virginia.
her tombstone reads, Nancy Hart 1846-1902 Civil War Heroine.