Third Corps, Army of Northern Virginia Third Corps, Army of Northern Virginia The Third Corps, Army of Northern Virginia was a unit of the Provisional Army of the Confederate States. After the death of Lt. General Thomas J. Jackson at the Battle of Chancellorsville, Robert E. Lee reorganized his army from two infantry corps into three corps, giving command of the new Third Corps to A. P. Hill. For Hill's new corps, Lee assigned Hill's old "Light Division", commanded by Major General William Dorsey Pender, from the Second Corps and Richard H. Anderson's division from James Longstreet's First Corps. For the Corps' third division, Lee created
Army of Northern Virginia Gen. J. E. Johnston as it was joined by the Army of the Shenandoah on July 20, 1861, when command was relinquished to General J. E. Johnston. The following day this army fought its first major engagement in the First Battle of Manassas. With the merging of the Army of the Shenandoah, Gen. Joseph E. Johnston took command from July 20, 1861, until May 31, 1862. Under the command of Johnston, the Army immediately entered into the First Battle of Manassas. On October 22, 1861, the Department of Northern Virginia was officially created, officially ending the Army of the Potomac.