Which Revolutionary War siege in Virginia ended with the British surrender in October 1781?

The Revolutionary War siege in Virginia that ended with the British surrender in October 1781 was the Siege of Yorktown.

The siege ran from September 28 to October 19, 1781, at Yorktown, Virginia. American forces under George Washington joined French troops commanded by the Comte de Rochambeau, while the French fleet under the Comte de Grasse blocked British help from reaching the town by sea.

British Lieutenant General Charles Cornwallis commanded the defenders. Allied troops gradually built artillery positions and captured key outer defenses, including Redoubts 9 and 10. Cornwallis opened surrender negotiations on October 17, and the formal surrender took place two days later.

Yorktown was the final major land engagement of the American Revolutionary War, although fighting continued elsewhere. The defeat helped begin serious peace negotiations, which led to the Treaty of Paris in 1783. A common mix-up is treating Yorktown as the instant the war legally ended; the treaty, not the battlefield surrender, recognized American independence.