Tecumseh and his brother organized a group of Indian tribes to resist the westward expansion of the United States. In 1811, Tecumseh's forces attacked Harrison's army in the Battle of Tippecanoe, earning Harrison fame and the nickname "Old Tippecanoe". In an account of the aftermath of the battle, Tecumseh's brother Tenskwatawa supposedly set a curse against Harrison. This is the basis of the curse legend, even though it was Richard Mentor Johnson who was said to be the man who killed Tecumseh.