In a final Native American attempt to drive out the British west of the Appalachians, known as Pontiac's War, the Odawa leader Pontiac began with an assault on British forts in May 1763. Ohio Valley and Great Lakes tribes overran many forts; one of their most important targets was Fort Pitt. Receiving warning of the coming attack, Captain Simeon Ecuyer, the Swiss officer in command of the garrison, prepared for a siege. He leveled the houses outside the ramparts and ordered all settlers into the fort: 330 men, 104 women, and 196 children sought refuge inside its ramparts. Captain Ecuyer also gathered stores, which included hundreds of barrels of pork and beef. Pontiac's forces attacked the fort on June 22, 1763. The siege of Fort Pitt lasted for two months. Pontiac's warriors kept up a continuous, though ineffective, fire on it from July 27 through August 1, 1763. They drew off to confront the relieving party under Colonel Bouquet, which defeated them in the Battle of Bushy Run. This victory sealed British dominion over the forks of the Ohio, if not the entire Ohio valley. In 1764 Colonel Bouquet added a redoubt, the Fort Pitt Blockhouse, which still stands, the sole remaining structure from Fort Pitt and the oldest authenticated building west of the Allegheny Mountains.