Culpeper, Va. Battery A, 4th U.S. Artillery, Robertson's Brigade (U.S. Civil War) This designation refers to a specific artillery unit during the American Civil War. The Culpeper, Virginia Battery A, was part of the 4th United States Artillery Regiment and served under Robertson's Brigade. The 4th U.S. Artillery was a regular army unit that existed from 1861 to 1905. Its role in the Civil War included providing artillery support to Union forces during significant battles, such as the Second Battle of Bull Run (Manassas), Antietam, Fredericksburg, Chancellorsville, Gettysburg, and others. The exact composition, command structure, and actions of Battery A within Robertson's Brigade may vary based on specific campaigns and time periods during the Civil War. As a historical subject, this artillery unit offers insights into the military strategies, leadership, and technology used during the American Civil War.