The 1st Regiment, South Carolina Infantry was also known as Butler's 1st Regiment, South Carolina Infantry, 1st South Carolina Infantry Regulars, 1st Regulars or Enlisted Men and several variations of those names. This regiment first served in the Army of the State of South Carolina with ten companies but it was accepted into the service of the Confederate States in May, 1861, with only eight companies, A to H. Companies I and K were added early in 1862. Although called an infantry regiment it acted as artillery. In May 1863, the 1st Regiment was designated the 3rd Regiment South Carolina Artillery or 3rd Heavy Artillery Regiment, but this designation was not confirmed although the regiment continued to serve as artillery. This regiment surrendered with Johnston's forces at Durham Station on April 26, 1865.