Blue Ball is -- or was -- in Sections 8 and 9 in Lemon Township in Butler County and in Franklin Township in Warren County, around the intersections of Ohio 122 and Cincinnati-Dayton Road, and Roosevelt Avenue and Cincinnati-Dayton Road, west of I-75. The name came the oval blue sign at the Blue Ball Tavern, which for several years was a mail station on a stagecoach line between Cincinnati and Dayton. The original name of the community was Guilford, for the Revolutionary War battle of March 15, 1781, at Guilford Courthouse, near Greensboro, North Carolina. The British, led by General Charles Cornwallis, won the battle over American troops commanded by General Nathanael Greene, but British casualties (about 530 out of about 1,600 men) were so great that they lost control of the Carolinas to the Americans, whose loss was about 160 men out of about 4,450 engaged. A Blue Ball post office was established Aug. 15, 1844, and continued until March 29, 1902. It was annexed to Middletown as the city's corporate limits extended into Warren County, including the Towne Mall regional shopping center north of Ohio 122 near I-75. Blue Ball has been the site of a monument to the Poland-China pig, believed to be the only monument to a pig in the United States. The marker -- along Cincinnati-Dayton Road or the Dixie Highway in Warren County -- was dedicated June 15, 1922.