After the success of his newly formed Sharpshooter Battalion at Chancellorsville, General Lee mandated the forming of Division Sharpshooters throughout his ANV. Virtually every Regiment contributed men to the Division Sharpshooters.

For a comprehensive history of the development of the Sharpshooters in the ANV, I would recommend "Shock Troops of the Confederacy" by Fred Ray.
http://www.cfspress.com/sharpshooters/