Cavalry in The American Civil War - Roles

Roles

At the time of the Civil War, the cavalry had five major missions, in rough priority:

1. Reconnaissance and counter-reconnaissance screening
2. Defensive, delaying actions
3. Pursuit and harassment of defeated enemy forces
4. Offensive actions
5. Long-distance raiding against enemy lines of communications, supply depots, railroads, etc.

This represented a change from previous eras, in which offensive action was the primary mission. In the Napoleonic Wars, for instance, there were instances of massive cavalry charges used for tactical envelopments of infantry formations. The technology of the rifled musket, which emerged in the 1850s, put an effective end to this practice. While swiftly moving cavalry could overwhelm infantry whose weapons fired accurately only 100 yards, the infantryman with a rifled musket (accurate to 300 yards or more) could fire multiple rounds in the time it took the cavalry to reach his position. And a horse and rider were easy targets.

Offensive actions were certainly not unknown, however, but they were more frequently employed against enemy cavalry than against infantry. Examples of offensive actions include the Battle of Brandy Station and the Battle of Yellow Tavern; cavalry versus cavalry examples include the First Battle of Bull Run and Elon J. Farnsworth's ill-fated charge on the third day of the Battle of Gettysburg.

Reconnaissance was the key to effective cavalry, as it remains today in modern armies (although modern cavalrymen use light armored vehicles or helicopters instead of horses). The cavalry serves as the "eyes" of the army. Reconnaissance was a crucial component in the Gettysburg Campaign, where cavalry under Union General Alfred Pleasonton attempted to find the wide-ranging Army of Northern Virginia on its invasion of the North, and Confederate cavalry under J.E.B. Stuart effectively employed counter-reconnaissance to screen passes in the Blue Ridge Mountains and hide Robert E. Lee's movements.

Long-distance raids were the most desirable mission for cavalrymen, primarily because of the fame that successful raids would bring, but they were often of little practical strategic value. Jeb Stuart became famous for two audacious raids around the Union Army of the Potomac in 1862; in his third such attempt, during the Gettysburg Campaign, he squandered much of the cavalry forces of the Army of Northern Virginia and deprived Robert E. Lee of adequate reconnaissance at the beginning of the Battle of Gettysburg, one of the principal reasons for the Confederate defeat there. Union attempts at strategic raids had mixed success. George Stoneman's raid in the Battle of Chancellorsville was a failure; Benjamin Grierson's raid in the Vicksburg Campaign was a strategic masterpiece that diverted critical Confederate forces away from Ulysses S. Grant's army; James H. Wilson's massive 1865 raid in Alabama foreshadowed the armored warfare maneuvers of World War II. In general, strategic raids were used more effectively in the Western Theater of the war.

Defensive actions by the cavalry were critical in the retreat from Gettysburg. Pursuit and harassment of enemy forces were often neglected (particularly by the Union after Gettysburg and Antietam), but can be seen in their finest form in the pursuit of Robert E. Lee during the Appomattox Campaign.