PITTSBURGH — Dozens of Civil War-era cannonballs unearthed at a Pittsburgh construction site will be removed by a Maryland firm. The Pittsburgh Post-Gazette (http://bit.ly/2oEtKnf ) reports Ordnance Holdings Inc., of Reisterstown, has been hired to remove the cannonballs found near the former site of the Allegheny Arsenal. The arsenal supplied the Union Army, and an
