(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.
On September 5, 1781 the French fleet under the command of Admiral de Grasse drove off the British fleet sent to relieve Cornwallis. The trap was now set. The siege of Yorktown began on September 28, 1781 and ended with a Franco-American victory on October 19, 1781 â the decisive battle of the Revolutionary War.