The American commander who played a key role in the siege operations at Yorktown was Marquis de Lafayette.

The Marquis de Lafayette played a key role in the siege of Yorktown during the Revolutionary War. As a young French general, he brought valuable military expertise and critical reinforcements to the American cause. His strategic planning and teamwork with General George Washington and other leaders were essential in encircling British General Cornwallis’s forces. Lafayette's leadership in troop deployment and coordination with French allies was instrumental in the successful siege that led to the British surrender. This victory marked a significant turning point in the war and solidified Lafayette's status as a prominent figure in the fight for American independence.