Date: August 28-30, 1862
2nd Manassas (2nd Bull Run)
Groveton on August 28,1862

Confederate Commader: Gen. Robert E. Lee
Army of Northern Virgina: ~55,000

Confederate Commanders:
I Corps MG James Longstreet
II Corps MG Thomas J. Jackson
Cavalry Division MG J.E.B. Stuart

Union Commander: MG John Pope
Army of Virginia: ~51,000

I Corps MG Franz Sigel
II Corps MG Nathaniel P. Banks
III Corps MG Irvin McDowell
Kanawha Division (detachment)

parts of three army corps of Gen. McClellan's Army of the Potomac:
(eventually joined Pope for combat operations, raising his strength to ~77,000)

III Corps MG S. P. Heintzelman
V Corps   MG Fitz John Porter
VI Corps  MG  William B. Franklin
IX Corps  MG  Jesse L. Reno

The Second Battle of Bull Run or Battle of Second Manassas was fought August 28–30, 1862. It was the culmination of the Northern Virginia Campaign waged by Confederate Gen. Robert E. Lee's Army of Northern Virginia against Union MG John Pope's Army of Virginia, and a battle of much larger scale and numbers than the First Battle of Bull Run (or First Manassas) fought on July 21, 1861 on the same ground.

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The battlefield handling of the Union forces by MG Pope was a major reason for the Confederate victory. There were a series of vague orders and poor communications between various commands that lead to Union forces being in a poor position to fend off a late day attack on August 30th by Confederate MG Longstreet.

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One interesting outcome of this battle was the court-martial of MG Fitz-John Porter.