The last major battle of the American Revolutionary War was the Siege of Yorktown, fought from September 28 to October 19, 1781. This decisive conflict involved American and French forces, led by General George Washington and Comte de Rochambeau, besieging British forces under General Cornwallis. The successful siege effectively trapped the British, leading to Cornwallis's surrender. The victory at Yorktown was pivotal, as it prompted negotiations that ultimately resulted in the Treaty of Paris in 1783, recognizing American independence and establishing the boundaries of the newly formed United States.