During the French and Indian War, British emissaries tried to persuade Native Americans in the Ohio Valley to abandon the French by promising to leave the land west of the Allegheny Mountains after the French were defeated. After the war ended on the frontier, however, the British kept their presence by constructing Fort Pitt, while settlers continued entering the region. As the British reduced gifts to the tribes and sharply restricted trade in critical items such as weapons and powder, Native peoples saw that the relationship was changing. In a vision, the “Master of Life” told the Delaware prophet Neolin that his people should return to the old ways, make war, and drive the British from the land. In the spring of 1773, Native forces attacked Fort Detroit, and the conflict quickly spread to western Pennsylvania, where Indians besieged Fort Pitt. In 1763, Fort Sandusky fell on May 16, Fort St. Joseph on May 25, Fort Miami on May 27, Fort Ouiatenon on June 1, Fort Michilimackinac on June 2, Fort Venango on June 16, Fort Le Boeuf on June 18, and Fort Pesque Isle on June 22; Fort Ligonier was attacked on June 2; Fort Pitt was besieged beginning May 29; Colonel Bouquet received Fort Pitt’s request for help on June 4, was ordered reinforcements on June 12, left Carlisle on July 15, arrived at Fort Bedford on July 25 and Fort Ligonier on August 2, left Fort Ligonier on August 4, was attacked by Native forces on August 5, defeated them at Bushy Run on August 6, and reached Fort Pitt on August 10.