The barn provided shelter in the 1840s for horses as their owners, members of the 4th regiment, formerly the 143rd, gathered for drill and inspections on orders from Colonel Samuel Burnett. An advertisement appeared in the September 30, 1845 edition of the American Republican to meet at Adam Rieitenbaugh’s to form a new volunteer company. They became known as the Union Troop of Chester and Delaware Counties and continued to appear on parade with their arms and equipment in perfect order for drills and inspections.