Question: What army did the man to whom Walter Herron Taylor was an aide command in the Civil War?
Context: Walter Gwynn (February 22, 1802 – February 6, 1882) was a civil engineer and soldier who became a Virginia Provisional Army general and North Carolina militia brigadier general in the early days of the American Civil War in 1861 and subsequently a Confederate States Army colonel.  He was a railroad engineer and railroad president before the Civil War, Florida Comptroller in 1863 and a civil engineer after the Civil War. John Thompson Brown (February 6, 1835 – May 6, 1864) was a Confederate States Army colonel and artillerist in the American Civil War.  He participated in the first exchange of cannon fire, in fact the first shots fired, between a Confederate force and a Union force in Virginia during the Civil War.  Brown's company of the Virginia (soon to be Confederate) Richmond Howitzers artillery regiment, with Brown in command according to some sources, and a Union force, the gunboat USS "Yankee", had a minor engagement at the Battle of Gloucester Point, Virginia on May 7, 1861.  Neither side suffered casualties.  Brown is credited by some sources with firing the first shot of the Civil War in Virginia at that first, minor engagement in the state.  During the war, he advanced from the rank of first lieutenant to the rank of colonel in charge of a division of artillery in the Army of Northern Virginia.  He was killed by a sharpshooter at the Battle of the Wilderness, May 6, 1864. Thomas Hart Taylor (July 31, 1825 – April 12, 1901) was a Confederate States Army colonel, brigade commander, provost marshal and last Confederate post commander at Mobile, Alabama during the American Civil War (Civil War).  His appointment as a brigadier general was refused by the Confederate Senate after Confederate President Jefferson Davis failed to nominate Taylor, apparently following Davis's appointment of Taylor to the rank.  Nonetheless, Taylor's name is frequently found on lists and in sketches of Confederate generals.  He was often referred to as a general both during the Civil War and the years following it.  Before the Civil War, Taylor served as a first lieutenant in the 3rd Kentucky Volunteer Infantry Regiment during the Mexican-American War.  After that war, he was a cattle driver, farmer and lawyer.  After the Civil War, he was engaged in business in Mobile, Alabama for five years, and after returning to Kentucky, was a Deputy U.S. Marshal for five years and was chief of police at Louisville, Kentucky for eleven years. Walter Husted Stevens (August 24, 1827 – November 12, 1867) was a Confederate States Army brigadier general during the American Civil War (Civil War).  He graduated from the United States Military Academy at West Point, New York and served in the corps of engineers, mostly in Louisiana and Texas.  He was an engineer for the Army of Northern Virginia.  He was reputed to be the last uniformed man to cross the Mayo Bridge during the evacuation of Richmond, Virginia after the Confederate defenses of Petersburg, Virginia collapsed on April 2, 1865.  After the Civil War, Stevens became the superintendent and engineer of the Mexican Imperial Railroad.  He died of yellow fever at Vera Cruz, Mexico, November 12, 1867. Andrusenko joined the Red Army in 1918, fighting in the Russian Civil War in Ukraine and the Polish–Soviet War.  During the interwar period, he became an infantry officer and studied at the Frunze Military Academy just before the German invasion of the Soviet Union in June 1941.  Andrusenko commanded two different rifle regiments in the Battle of Moscow before taking command of the 329th Rifle Division in December.  In March 1942, his division was encircled and destroyed.  Andrusenko escaped and was sentenced to death for "inaction", but the sentenced was changed to ten years and delayed until the end of the war.  He was demoted to command a cadet rifle brigade, which he led during the Battle of Stalingrad.  For an unauthorized retreat, he was again demoted to command of a regiment.  For his subsequent leadership of the regiment, Andrusenko was restored in rank and for his actions in the Battle of the Dnieper was awarded the title Hero of the Soviet Union.  In January 1944, he was given command of the 55th Rifle Division, leading it in Operation Bagration and the Baltic Offensive.  In the spring of 1945 Andrusenko took command of the 184th Rifle Division in the Soviet Far East and led it in the Soviet invasion of Manchuria in August of that year.  He retired from the army after the end of the war. Horace Brooks (August 14, 1814 – January 13, 1894) was an officer in the Regular Army of the United States from 1835 – 1877.  After graduating the United States Military Academy at West Point, he served in the Second Seminole War.  During the Mexican-American War he was promoted to the rank of captain and brevetted temporarily to the rank of lieutenant colonel.  During the American Civil War, he served in command of artillery batteries at various forts and was eventually placed in command of the 4th United States Artillery Regiment with the rank of colonel.  At the close of the civil war, he was awarded the honorary grade of brevet brigadier general.  He continued his career as a soldier after the Civil War, remaining in command of the 4th U.S. Artillery until his retirement in 1877. Lieutenant John R. McNulty of Baltimore, Maryland (1832–1912) was the Confederacy (American Civil War) war hero, who with a single strategic shot of his 2nd Maryland Artillery command’s (Baltimore Light Artillery) Confederate States of America (CSA) guns at the Battle of Old Town (U.S. Civil War 1864 Valley Campaign), while perilously close to Union Army (Federal) forces, saved Brig. Gen. (CSA) John McCausland’s element of the Army of Northern Virginia from entrapment behind Union (American Civil War) lines on return route from raids into Maryland and Pennsylvania and their sacking and burning of Chambersburg, Pennsylvania in retaliation for the Union Army burning of the Virginia Military Institute and as part of the Valley Campaigns of 1864. Walter Herron Taylor (June 13, 1838 – March 1, 1916) was an American banker, lawyer, soldier, politician, author, and railroad executive from Norfolk, Virginia.  During the American Civil War, he was an officer in the Confederate States Army, attaining the rank of lieutenant colonel as an aide to General Robert E. Lee.  He was later a senator in the Virginia General Assembly, and attorney for the Norfolk and Western Railway and later the Virginian Railway. Walter Herron Taylor, III (July 5, 1872 – August 1, 1960) was the first head football coach on record for the Virginia Military Institute Keydets located in Lexington, Virginia and he held that position for the 1891 season.  His career coaching record at VMI was 3 wins, 0 losses, and 1 ties.  This ranks him 25th at VMI in total wins and first at VMI in winning percentage.  He was the son of banker, lawyer, soldier, politician, author, and railroad executive Walter H. Taylor, who was also an aide-de-camp to Robert E. Lee. Robert Edward Lee (January 19, 1807 – October 12, 1870) was an American and Confederate soldier, best known as a top army commander of the Confederate States of America.  He commanded the Army of Northern Virginia in the American Civil War from 1862 until his surrender in 1865.  A son of Revolutionary War officer Henry "Light Horse Harry" Lee III, Lee was a top graduate of the United States Military Academy and an exceptional officer and military engineer in the United States Army for 32 years.  During this time, he served throughout the United States, distinguished himself during the Mexican–American War, and served as Superintendent of the United States Military Academy.
Answer: Army of Northern Virginia