Confederate Army of the Shenandoah Harpers Ferry, Virginia (modern day West Virginia). To organize and train the companies, Virginia state commander Robert E. Lee initially appointed Thomas J. Jackson to command the post. Jackson formed five regiments of infantry and a battery of artillery from the various companies, forming the basis of the Stonewall Brigade. On May 15, Joseph E. Johnston replaced Jackson as commander of Harpers Ferry and continued to receive additional regiments from throughout the Confederacy. He would eventually have four brigades of infantry and an independent regiment of cavalry, the 1st Virginia Cavalry commanded by J. E. B. Stuart. In mid-June, forces
Army of Northern Virginia campaign. The army was also joined for the Northern Virginia and Maryland Campaigns by Nathan G. Evans's independent South Carolina brigade and a North Carolina brigade led by Brig. Gen Thomas Drayton. During the Maryland Campaign, D.H. Hill rejoined the main army along with Lafayette McLaws. Kemper's division was merged with the division of David R. Jones, a more senior, experienced officer, and Kemper reverted to brigade command. In addition, Robert Ransom commanded two brigades from the Department of North Carolina. At Antietam, Longstreet commanded the divisions of Anderson, McLaws, Jones, Hood, and Ransom while Jackson had the divisions of