The following Union Army units and commanders fought in the Second Battle of Bull Run, also known as the Second Battle of Manassas, of the American Civil War. The Confederate order of battle is listed separately. Order of battle compiled from the army organization during the battle, the casualty returns and the reports.
1st Arkansas Mounted Rifles (1861–1865) was a Confederate States Army cavalry regiment during the American Civil War. The unit was formed as a mounted infantry regiment, but was dismounted in the spring of 1862 and remained dismounted for the remainder of the war. The unit participated in the earliest battles in the western theater at Wilson's Creek and surrendered with the remnants of the Army of Tennessee in North Carolina in April 1865.
The 6th Arkansas Infantry Regiment, commonly known as the "Sixth Arkansas", was a line infantry formation of the Confederate States Army in the Western Theater of the American Civil War.
The 5th Arkansas Infantry, also called the Fighting Fifth (1861–1865) was a Confederate Army infantry regiment organized in Arkansas to serve for the Confederate States of America during the American Civil War. It served throughout the war in the western theater, seeing action in the Kentucky, Tennessee and Georgia campaigns. Following its depletion in numbers the regiment was consolidated several times with other Arkansas regiments, finally merging in 1865 into the 1st Arkansas Consolidated Infantry Regiment. Another Arkansas unit also had the designation 5th Arkansas, the 5th Regiment, Arkansas State Troops which participated in the Battle of Wilson's Creek, but was never transferred to Confederate Service. There is no connection between the two units.
The 1st Regiment Kentucky Volunteers, CSA was an infantry regiment that served in the Confederate States Army during the American Civil War. It was the only Kentucky regiment in the Confederate service to serve in the Army of Northern Virginia.
The 2nd Tennessee Cavalry Regiment, also known as the 22nd Tennessee Cavalry after it was consolidated with the 21st Tennessee Cavalry (Wilson’s), was a cavalry unit of the Confederate States of America during the American Civil War, organized on June 12, 1862. The unit was originally commanded by Lieutenant-Colonel Clark Russell Barteau, who was promoted from the rank of private on the day that he was placed in command of the new regiment. He was promoted to colonel a year later.
The 7th Arkansas Volunteer Infantry (1861−1865) was a Confederate Army infantry regiment during the American Civil War. Organized mainly from companies, including several prewar volunteer militia companies, raised in northeastern Arkansas, the regiment was among the first transferred to Confederate service, and spent virtually the entire war serving east of the Mississippi River. After the unit sustained heavy casualties in the Battle of Shiloh and the Kentucky Campaign, the unit spent most of the rest of the war field consolidated with the 6th Arkansas Infantry Regiment to form the 6th/7th Arkansas Infantry Regiment.
The 3d Arkansas Cavalry Regiment (1861–1865) was a Confederate Army Cavalry regiment during the American Civil War.
The 25th Arkansas Infantry was an infantry regiment of the Confederate States Army during the American Civil War. The unit was originally organized as Turnbull's 11th Arkansas Infantry Battalion. Upon being increased by the required number of companies the battalion was organized as the 30th Arkansas Infantry Regiment but was later redesignated as the 25th Arkansas Infantry. There were two regiments officially designated as the 30th Arkansas Infantry. The other "30th Arkansas" served west of the Mississippi River, in the Department of the Trans-Mississippi and was also known as 5th Trans-Mississippi Regiment or the 39th Arkansas or Rogan's Arkansas Cavalry during Price's 1864 Missouri Expedition.
The 15th Arkansas Infantry Regiment or Josey's Arkansas Infantry Regiment was an infantry formation in the Confederate States Army during the American Civil War. The regiment was organized in May 1861 under the command of Colonel Patrick Cleburne. It served throughout the war in the western theater, seeing action in the Kentucky, Tennessee, and Georgia campaigns. Following its depletion in numbers the regiment was consolidated several times with other Arkansas regiments, finally merging in 1865 into the 1st Arkansas Consolidated Infantry Regiment. There were two other regiments which also received the designation of "15th Arkansas". The 21st (McRae's) Arkansas Infantry was redesignated 15th Arkansas in February 1863, but to avoid confusion, was normally referred to as the "Northwest regiment". This second "15th Arkansas" was surrendered at Vicksburg in July 1863. A third regiment, under command of Colonels Gee and later Johnson, also received the designation 15th Arkansas Infantry. This last regiment surrendered at Port Hudson, Louisiana, in July 1863.
The 18th Arkansas Infantry (Marmaduke's) (1861–1865) was a Confederate Army infantry regiment during the American Civil War. The unit was also briefly identified as the 1st Arkansas Infantry Battalion. The unit was most often referred to as the 3rd Confederate Infantry Regiment. The designation "Confederate Infantry Regiment" was intended to convey the difference between Provisional Confederate Army units and Regular Confederate Army Units, with Provisional units being those regiments who received a state designation such as "XX Arkansas Infantry Regiment". In practice, the designation was most often utilized when Regiments were assembled utilizing companies from more than one Confederate state. The "3rd Confederate Infantry Regiment" is occasionally misidentified as the 3rd Arkansas Infantry Regiment commanded by Colonel Van H. Manning.
The 154th Regiment, Tennessee Infantry was an infantry regiment from Tennessee that served with the Confederate States Army in the American Civil War. Raised originally in 1842 as the 154th Tennessee Militia it sought to retain its number and was as such also known as 154th (Senior) Tennessee Infantry . Consolidating with the 13th Tennessee Infantry Regiment in March 1863 it was known as 13th-154th Tennessee Infantry Regiment; and had a number of temporary field consolidations until it was finally merged into the 2nd Consolidated Tennessee Infantry on April 9, 1865. The regiment surrendered with the remnants of the Army of Tennessee at Bennett Place on April 26, 1865.
The 9th Arkansas Infantry Regiment was a regiment of the Confederate States Army during the American Civil War. It served in the Western Theater, seeing action in the Vicksburg, Tennessee and Georgia campaigns. Due to attrition; the 9th Arkansas was consolidated several times with other Arkansas regiments, finally merging in 1865 into the 1st Arkansas Consolidated Mounted Rifles.
Benjamin Hardin Helm was an American politician, attorney, and Confederate brigadier general. A son of Kentucky governor John L. Helm, he was born in Bardstown, Kentucky. He attended the Kentucky Military Institute and the West Point Military Academy and then studied law at the University of Louisville and Harvard University. He served as a state legislator and the state's attorney in Kentucky. Helm was offered the position of Union Army paymaster by his brother-in-law, President Abraham Lincoln, a position which he declined. Helm joined the Confederate States Army. As a brigadier general, Helm commanded the 1st Kentucky Brigade, more commonly known as The Orphan Brigade. He died on the battlefield during the Battle of Chickamauga.
Charles Constantine Crews was an attorney, physician, railroad executive and Confederate Colonel in the American Civil War. Between 1862 and 1865, he participated in most of the Western Theater cavalry campaigns of Major General Joseph Wheeler, initially leading the 2nd Georgia Cavalry and eventually a cavalry brigade.
The 1st Florida Infantry Regiment was an infantry regiment raised by the Confederate state of Florida during the American Civil War. Raised for 12 months of service its remaining veterans served in the 1st (McDonell's) Battalion, Florida Infantry from April 1862 on. In August the depleted battalion was consolidated with the 3rd (Miller's) Battalion into the reorganized 1st Florida Infantry Regiment again. In December 1862 it merged with the 3rd Florida Infantry Regiment and received the form it kept till the war's end as the 1st and 3rd Consolidated Florida Infantry Regiment. Fighting as part of the Army of Tennessee in the Western Theater of the American Civil War it was surrendered on April 26, 1865.
The 1st Georgia Cavalry Regiment was a cavalry regiment in the Confederate States Army, during the American Civil War.
Confederate States of America 
Confederate States Army 
