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 Mackinac communities such as the Wyandots near Detroit, who had been friendly to the Americans or neutral, to rally to the British cause. Their hostility influenced the U.S. surrender at the Siege of Detroit shortly afterwards. Lieutenant Hanks was killed by a cannon shot at Detroit shortly before the surrender, while awaiting a court martial for cowardice. British control of Fort Mackinac and northern Michigan was not seriously challenged until 1814 when a large American force was dispatched to retake control of the area. However, the American force was defeated in the Battle of Mackinac Island and the Engagements on Lake