Keywords: Batteries for Entrenchment on south side and Batteries on north side, Conowingo Bridge, Susquehannah (sic) River, Md.... - NARA - 305789.jpg Scope and content General notes 305789 Local identifier 77-FORTS-DR145SHT13 War Department Office of the Chief of Engineers 1818 - 09/18/1947 Cartographic and Architectural Records Section Special Media Archives Services Division NWCS-C National Archives at College Park 8601 Adelphi Road College Park MD 20740-6001 ca date 1864 11 24 Record group Record Group 77 Records of the Office of the Chief of Engineers 1789 - 1999 Record group ARC 406 Fortifications Map File Plans of Military Forts compiled 1790 - 1941 Series ARC 305749 File unit File unit ARC Variant control numbers NAIL Control Number NWDNC-77-FORTS-DR145SHT13 Other versions <gallery> File Batteries_for_Entrenchment_on_south_side_and_Batteries_on_north_side _Conowingo_Bridge _Susquehannah_ sic _River _Md _-_NARA_-_305789 tif tif File Batteries_for_Entrenchment_on_south_side_and_Batteries_on_north_side _Conowingo_Bridge _Susquehannah_ sic _River _Md _-_NARA_-_305789 jpg jpg </gallery> NARA-cooperation PD-USGov Pennsylvania in the American Civil War Susquehanna River Gun emplacements Bridges in the United States completed in 1820 1820s bridges in Pennsylvania |