(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 Princeton. The Battle of Princeton (January 3, 1777) was a pivotal battle in the American Revolutionary War in which the Continental Army, commanded by General George Washington, defeated British forces near Princeton, New Jersey.