At Prophetstown, Tecumseh and Tenskwatawa initially worked to maintain a peaceful coexistence with the United States. A major turning point came in September 1809, when William Henry Harrison, governor of the Indiana Territory, negotiated the Treaty of Fort Wayne, purchasing of land in what is present-day Indiana and Illinois. Although many Indian leaders signed the treaty, others who used the land were deliberately excluded from the negotiations. The treaty created widespread outrage among Indians, and, according to historian John Sugden, "put Tecumseh on the road to war" with the United States.