https://www.wvhistoryonview.org/catalog/053725https://www.wvhistoryonview.org/image/053725.jpgPetersburg From Civil War Fort, Petersburg, W. Va. undatedRivers--Potomac.West Virginia--History--Civil War, 1861-1865--Battlefields.The Civil War fort, Fort Mulligan, sits on top a hill and looks over the South Branch Potomac River. West Virginia History OnView