Which American militia leader during the Revolutionary War was nicknamed the "Conqueror of the Old Northwest"?

George Rogers Clark (November 19, 1752 – February 13, 1818) was an American surveyor, soldier, and militia officer from Virginia who became the highest-ranking American patriot military officer on the northwestern frontier during the American Revolutionary War. He served as leader of the militia in Kentucky (then part of Virginia) throughout much of the war. He is best known for his captures of Kaskaskia (1778) and Vincennes (1779) during the Illinois Campaign, which greatly weakened British influence in the Northwest Territory. The British ceded the entire Northwest Territory to the United States in the 1783 Treaty of Paris, and Clark has often been hailed as the "Conqueror of the Old Northwest".

He was the older brother of William Clark of the famous Lewis and Clark Expedition.