At the Second Battle of Corinth on 3–4 October 1862, Battery H, 1st Missouri Light Artillery was armed with a mix of 10-pounder Parrott rifles and 24-pounder howitzers. In 1862 alone, the US government ordered 270,699 Parrott projectiles. This included ammunition for Parrott rifles other than the 10-pounder. On 2 July 1863 during the Battle of Gettysburg, the six 10-pounder Parrott rifles of the 5th U.S. Artillery, Battery D commanded by Captain Charles E. Hazlett took position on Little Round Top. When General Gouverneur K. Warren pointed out that the guns would not be able to fire on their attackers, Hazlett replied, "The sound of my guns will be encouraging to our troops." In mid-war, the Army of the Potomac began replacing the 10-pounder Parrott with the 3-inch Ordnance rifle. By May 1864, only five of the 49 batteries in the Army of the Potomac were armed with 10-pounder Parrotts. The Parrott rifles were not used again after the end of the war.