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| Union and Confederate Armies | |
|---|---|
| Name | Union and Confederate Armies |
| Conflict | American Civil War |
| Active | 1861–1865 |
| Size | Union: ~2,128,948 volunteers and draftees; Confederate: ~750,000–1,200,000 estimated |
| Notable commanders | Union: Abraham Lincoln, Ulysses S. Grant, William Tecumseh Sherman, George B. McClellan, George G. Meade, Joseph Hooker, Ambrose Burnside, Winfield Scott Hancock, Don Carlos Buell, John A. Logan, Oliver O. Howard; Confederate: Jefferson Davis, Robert E. Lee, Thomas "Stonewall" Jackson, James Longstreet, J. E. B. Stuart, Braxton Bragg, Joseph E. Johnston, P. G. T. Beauregard, John Bell Hood, Nathan Bedford Forrest, A. P. Hill |
| Notable battles | Battle of Gettysburg, Battle of Antietam, Battle of Shiloh, Battle of Chancellorsville, Siege of Vicksburg, Battle of Fredericksburg, Battle of Cold Harbor, First Battle of Bull Run, Second Battle of Bull Run, Battle of Fort Sumter, Battle of Corinth, Battle of Pea Ridge |
Union and Confederate Armies
The land forces fielded by the North and the South in the American Civil War consisted of complex organizations that evolved from prewar militia traditions into large wartime armies. They were shaped by leaders, institutions, logistics, technology, and campaigns spanning Fort Sumter to Appomattox, influencing postwar politics, society, and memory. The following sections examine origins, recruitment, leadership, materiel, campaigns, human costs, and legacies.
Antebellum frameworks derived from United States Army regimental systems, state militias such as the Massachusetts Militia and the Virginia Militia, and veterans of the Mexican–American War. The Union relied on federal structures including the United States War Department, the Regular Army (United States), and state volunteer regiments from New York (state), Pennsylvania, Ohio, Massachusetts, Illinois (state), Indiana (state), and Michigan (state). The Confederacy formed the Confederate States Army under Confederate States of America institutions with major contributions from Virginia (state), North Carolina, Tennessee, Georgia (U.S. state), and South Carolina. Early organization reflected influences from professional officers trained at United States Military Academy, state politics in Richmond, Virginia, and military thinkers like Dennis Hart Mahan and Emory Upton.
Initial manpower depended on volunteerism inspired by leaders such as Abraham Lincoln and Jefferson Davis, patriotic rallies in cities like Philadelphia, Boston, Richmond, and New Orleans, Louisiana, and enlistment incentives like bounties used in New York City. The Enrollment Act of 1863 instituted Union conscription with substitutes and commutation fees; Confederate conscription laws passed by the Confederate Congress created exemptions for overseers of critical industries and the controversial "twenty-slave" proviso. Ethnic units included 54th Massachusetts Infantry Regiment, Irish brigades from New York, German regiments from Pennsylvania, and units like the Louisiana Native Guard. African American service was formalized via the United States Colored Troops and affected manpower politics in places such as Washington, D.C. and Port Royal, South Carolina.
Union strategic direction shifted among proponents of limited war and total war, from the Anaconda Plan advocated by Winfield Scott to Ulysses S. Grant's coordinated offensives linking theaters. Confederate strategy emphasized decisive battles and interior lines under thinkers like Robert E. Lee and planners in Richmond, relying on cavalry leaders such as J. E. B. Stuart for reconnaissance. Corps and army commands evolved in structures like the Army of the Potomac, the Army of Northern Virginia, the Army of the Tennessee, and the Army of the Cumberland, with corps commanders including John Pope, Ambrose Burnside, James Longstreet, and William S. Rosecrans. Naval-riverine cooperation involved actors such as David Dixon Porter and influenced campaigns at Vicksburg and along the Mississippi River.
Uniforms ranged from the Union dark blue of regiments from New York (state) and Massachusetts to the Confederate gray and butternut issued in arsenals like Richmond Arsenal. Small arms included the Springfield Model 1861, Enfield rifle-musket, and a diversity of smoothbore and rifled artillery such as the Parrott rifle and Napoleon (cannon). Railroads like the Baltimore and Ohio Railroad and Western and Atlantic Railroad were strategic logistics assets; supply systems ran through depots in Alexandria, Virginia, Chattanooga, Tennessee, Savannah, Georgia, and St. Louis, Missouri. Innovations included the telegraph, ironclads like USS Monitor and CSS Virginia, and medical transport evolving from civilian ambulances to organized corps engineered by figures like Jonathan Letterman.
Key campaigns included Peninsula Campaign, Gettysburg Campaign, Vicksburg Campaign, Sherman's March to the Sea, Atlanta Campaign, Overland Campaign, and operations in the Western Theater such as Shiloh and Chattanooga Campaign. Decisive battles like Battle of Gettysburg, Battle of Antietam, Battle of Chancellorsville, and Battle of Fort Donelson shaped political outcomes including the Emancipation Proclamation. Riverine and coastal actions at New Orleans and Mobile Bay complemented land campaigns. Operational art by commanders such as Ulysses S. Grant, William Tecumseh Sherman, Robert E. Lee, and Joseph E. Johnston determined siege outcomes at Vicksburg and Petersburg.
Casualty figures approach tremendous scale with battles producing heavy losses at Gettysburg, Chancellorsville, and Antietam (Sharpsburg); disease in camps like Camp Douglas and Camp Chase claimed many more lives. Medical practices evolved under surgeons such as Jonathan Letterman and Samuel D. Gross with advances in triage, amputation techniques, and hospital organization in sites like Armory Square Hospital. Prisoner systems centered on Andersonville Prison (Camp Sumter) and Libby Prison, with exchanges halted after the Dix–Hill Cartel breakdown and controversies over treatment and mortality.
Postwar demobilization involved mustering out through offices in Washington, D.C. and state adjutancies in Richmond and northern capitals, reintegration of veterans into communities like Gettysburg, Pennsylvania and Charleston, South Carolina, and contested memory shaped by organizations such as the Grand Army of the Republic and the United Confederate Veterans. Political careers of veterans included figures like Rutherford B. Hayes, Benjamin Harrison, James A. Garfield, and former Confederates who sought pardons through Andrew Johnson's policies. Monuments and commemorations at battlefields such as Gettysburg National Military Park, Vicksburg National Military Park, and Shiloh National Military Park reflect reconciliation and Lost Cause narratives debated in historiography by scholars referencing Reconstruction, the Dunning School, and revisionist work engaging William A. Dunning and later historians.
Category:American Civil War armies