Number of casualties at the Battle of the Second Manassas 1862

The Battle of Second Manassas (also known as the Second Battle of Bull Run), was fought between General Robert E. Lee's Confederate forces, and the Union's Army of Virginia, commanded by General John Pope. The battle began on August 28, 1862, when Major General Thomas J. 'Stonewall' Jackson captured a Union supply depot (on the 27th) and then held a nearby defensive position awaiting Pope's response, which came in the form of an assault on the 28th and 29th. During this time, Jackson's colleague, General James Longstreet, maneuvered his own forces in order to outflank Pope as he attacked Jackson's position. The subsequent attack on the 30th, by both Confederate armies on Pope's forces, became the largest coordinated assault of the war, which crushed the Union army on two fronts. Almost twenty percent of the Union forces involved became casualties, and this number would have been much higher had the Union rearguard not successfully protected their retreat.