Fort Pitt (Pennsylvania) among Native Americans devastated the tribes of Ohio Valley and the Great Lakes areas. On August 1, 1763, most of the American Indians broke off the siege to intercept the approaching force under Colonel Bouquet. In the Battle of Bushy Run, Bouquet fought off the American Indian attack and relieved Fort Pitt on August 10. In 1772, after Pontiac's War, the British commander at Fort Pitt sold the building to two colonists, William Thompson and Alexander Ross. At that time, the Pittsburgh area was claimed by the colonies of both Virginia and Pennsylvania, which struggled for power over the region.
Siege of Fort Vincennes it Illinois County in December 1778. In early 1781, Virginia resolved to hand the region over to the central government, paving the way for the final ratification of the Articles of Confederation. These lands became the Northwest Territory of the United States. Siege of Fort Vincennes The Siege of Fort Vincennes (also known as the Siege of Fort Sackville or the Battle of Vincennes) was a Revolutionary War frontier battle fought in present-day Vincennes, Indiana won by a militia led by American commander George Rogers Clark over a British garrison led by Lieutenant Governor Henry Hamilton. Roughly half of Clark's