The western portions of Pennsylvania were among disputed territory between the colonial British and French during the French and Indian War (the North American component of the Seven Years' War). The French had established numerous fortified sites in Pennsylvania, including Fort Le Boeuf, Fort Presque Isle, Fort Machault, and the pivotal Fort Duquesne, located near the present site of Pittsburgh. Many Indian tribes were allied with the French because of their long trading history and opposition to the expansion of the British colonies. The conflict began near the present site of Uniontown, Pennsylvania when a company of Virginia militia under the command of George Washington ambushed a French force at the Battle of Jumonville Glen in 1754. Washington retreated to Fort Necessity and surrendered to a larger French force at the Battle of Fort Necessity. In 1755, the British sent Braddock Expedition to capture Fort Duquesne, but the expedition ended in failure after the British lost the Battle of the Monongahela near present-day Braddock, Pennsylvania. In 1758, the British sent the Forbes Expedition to capture Fort Duquesne. The French won the Battle of Fort Duquesne, but after the battle the outnumbered French force demolished Fort Duquesne and retreated from the area. Fighting in North America had mostly come to an end by 1760, but the war continued until the signing of the Treaty of Paris in 1763. Britain's victory in the war helped secure Pennsylvania's frontier, as the Ohio Country came under formal British control. Although New France was no more, the French would deal their British rivals a major blow in the American Revolution by aiding the rebel cause.