(Definition of harp on (about sth) from the Cambridge Advanced Learners Dictionary & Thesaurus Â© Cambridge University Press).
Battle of Saratoga. In late September and during the first week of October 1777, Gate's American army was positioned between Burgoyne's army and Albany. On October 7, Burgoyne took the offensive. The troops crashed together south of the town of Saratoga, and Burgoyne's army was broken. In mop-up operations 86 percent of Burgoyne's command was captured.
Battle of Saratoga. Made up of two battles: Battle of Freeman's Farm and battle of Bemis Heights (both in 1777). Turning point in the war. Battle that convinced the French to join the Continental army. Gates and Arnold defeated Burgoyne.