The old Naval Battery was reinforced as well in June, 1863. The sandbag parapet was replaced by earthworks, the emplacement was enlarged and embrasured, and four magazines were added. Loudoun Heights received its share of attention, but that share paled in comparison to the work on Maryland Heights. Units of the Twelfth Corps occupied Loudoun on September 22, 1862. They cut trees and built stone works and a signal station on its crest. -- Earl Hess