 Complete the following phrase:  Independent Battery D, Pennsylvania Light Artillery, was an artillery battery that served in the Union Army during the American Civil War. The unit organized on 21 September 1861 and served until 13 June 1865. The battery participated in the battles of Second Bull Run, Chantilly, South Mountain, Antietam, and Fredericksburg in 1862. The following year, Battery D transferred to the Western theater where it took part in the Siege of Vicksburg and other operations. The years 186465 saw the unit fight at the first Petersburg assault, the Crater, Reams Station, Battle of Peebless Farm, Fort Stedman, and 