During the Battle of Pea Ridge in March 1862, a Confederate unit, Landis' Missouri Battery was armed with four guns, two of which were 24-pounder howitzers. At the Battle of Antietam on 17 September 1862, the Confederate Army of Northern Virginia employed four 24-pounder howitzers. Two were part of James Reilly's six gun (Rowan) North Carolina Battery and two were in George V. Moody's four gun (Madison) Louisiana Battery. The Union Army of the Potomac employed none at Antietam, but at the Battle of Harpers Ferry, the Confederates captured 47 Federal artillery pieces, including six 24-pounder howitzers. At the Battle of Gettysburg on 1–3 July 1863, the Confederate army again utilized four 24-pounder howitzers.