Sara writes a letter to Moses from Yorktown describing the preparations for a battle. She also informs him that his brother Cato is fighting for the British. Meanwhile, the French fleet is crossing a stormy Atlantic to help their American allies. In New York, the American soldiers are preparing for a march to New York City, unaware that they will be heading to Yorktown in Virginia.
In Yorktown, British soldiers are dying of heat exhaustion prompting General Cornwallis to order all the black soldiers to fortify the stronghold. In Philadelphia, General Washington and his troops along with James march through the city amidst cheering crowds. Moses insists on joining them to the march to Yorktown.
Meanwhile, Admiral Degrass and his fleet engages the British and sends them running. Washington finally arrives in Virginia and reunites with Lafayette. Then, the Allies discuss their plans for the siege of Yorktown. The next day the British discover that they are surrounded. The battle begins as Sara, James, and Henri find a safe place to watch it from. As the battle rages, realizing that they might be defeated, the black soldiers fighting for the British, run for it including Cato. On October 17, 1781, the British finally surrender. This marks the end of the war for American independence.