 He negotiated numerous land cession treaties with American Indians, including the Treaty of Fort Wayne on September 30, 1809 in which Miami, Pottawatomie, Lenape, and other tribal leaders sold 3,000,000 acres (approximately 12,000 km²) to the United States.Tenskwatawa was known as the Prophet and had been leading a religious movement among the northwestern tribes, calling for a return to the ancestral ways.His brother Tecumseh was outraged by the Treaty of Fort Wayne, and he revived an idea advocated previously by Shawnee leader Blue Jacket and Mohawk leader Joseph Brant, which stated that Indian land was owned in common by all tribes, and land could not be sold without agreement by all the tribes.