After taking part in the first phase of the French and Indian War (also known as "Braddock's War") as allies of the French, the Shawnee switched sides in 1758. They made formal peace with the British colonies at the Treaty of Easton, which recognized the Allegheny Ridge (the Eastern Divide) as their mutual border. This peace lasted only until Pontiac's War erupted in 1763, following Britain's defeat of France and takeover of its territory east of the Mississippi River in North America.