The 5th Cavalry Regiment is a historical unit of the United States Army that began its service on August 3, 1861, when an act of Congress enacted "that the two regiments of dragoons, the regiment of mounted riflemen, and the two regiments of cavalry shall hereafter be known and recognized, as the first, second, third, fourth, and fifth regiments of cavalry respectively..." and continues in modified organizational format in the U.S. Army.

William Joseph Hardee was a career U.S. Army and Confederate States Army officer. For the U.S. Army, he served in the Second Seminole War and in the Mexican–American War, where he was captured and exchanged. In the American Civil War, he sided with the South and became a general. Hardee served in the Western Theater and quarreled sharply with two of his commanding officers, Braxton Bragg and John Bell Hood. He served in the Atlanta Campaign of 1864 and the Carolinas Campaign of 1865, where he surrendered to General Joseph E. Johnston to William Tecumseh Sherman in April. Hardee's writings about military tactics were widely used on both sides in the conflict.