At St. Louis in 1804, future president William Henry Harrison negotiated a treaty with two representatives of the Sauk nation who had come to the city on other business. When it was over, the government believed it had secured the right to open all Sauk lands east of the Mississippi to settlement, for a mere $2,500. Sauk chiefs back home in Illinois and Wisconsin, however, believed that the two negotiators had never possessed the authority to speak for the whole nation and that the treaty was therefore invalid. The Indians continued to inhabit their village of Saukenuk near the mouth of the Rock River, where they had lived since the mid-eighteenth century, near the Ho-Chunk village of Prophetstown.
A quarter century later, lead was being profitably mined in the Rock River region and thousands of settlers were swarming to it without regard for treaties or the land's original owners. Keokuk and other Sauk leaders who thought it was futile to resist overwhelming white military force complied with an 1829 government order to move across the Mississippi in return for enough corn to get through the winter. But when the government failed to honor its promises concerning this move, a group of about 1,200 Sauk under the leadership of Black Hawk (Ma-ka-tai-me-she-kia-kiak) returned to the Illinois side of the river in the hope of re-occupying their homeland and harvesting their corn. Black Hawk believed that the 1804 treaty was fraudulent, that his Ho-Chunk neighbors would join him in fighting the Americans if necessary, and in the event of full-scale war the British would also come to his aid.
