Angered by the loss of his birthplace, Black Hawk led a number of incursions across the Mississippi River into Illinois between 1830 and 1831, but each time was persuaded to return west 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 1,000 warriors and non-combatants into Illinois. Finding no allies, he attempted to return across the Mississippi to present-day Iowa, but the undisciplined Illinois Militia's actions led to Black Hawk's surprising victory at the Battle of Stillman's Run. A number of other engagements followed, and the militia of Michigan Territory and the state of Illinois were mobilized to hunt down Black Hawk's band. The conflict became known as the Black Hawk War.