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.
Fort Defiance (Ohio) had agreed not to settle. Until the War of 1812, Fort Defiance was one of the westernmost outposts in Ohio. William Henry Harrison used it as one base for his attacks against Native Americans during Tecumseh's War, and the fort played a role in the War of 1812 as well. The city of Defiance, Ohio, was founded at the fort's location. In 1904, the site of the fort was chosen for the Defiance Public Library. Fort Defiance served as a reference point for defining the boundary line of land cession in the Treaty of Detroit in 1807. This north-south line