As a consequence of an 1804 treaty between the Governor of Indiana Territory and a group of Sauk and Fox leaders regarding land settlement, the Sauk and Fox tribes vacated their lands in Illinois and moved west of the Mississippi in 1828. However, Sauk Black Hawk and others disputed the treaty, claiming that the full tribal councils had not been consulted, nor did those representing the tribes have authorization to cede lands. Angered by the loss of his birthplace, between 1830–1831 Black Hawk led a number of incursions across the Mississippi River, but was persuaded to return west each time without bloodshed. In April 1832, encouraged by promises of alliance with other tribes and the British, he again moved his so-called "British Band" of around 1000 warriors and non-combatants into Illin