Soon after the treaty, Black Hawk and his war party retaliated for murders committed by Menomonees and Sioux in 1830 by attacking and killing twenty-seven Menomonees near Fort Crawford, Prairie du Chien; General Joseph Street, the United States Indian agent there, on complaint of the Menomonees, demanded the surrender of the Sac murderers for trial under existing treaty provisions.

The evidence

• “During the year 1830 a party of ]\Ienomonees and Sioux had murdered some of the British band of Sacs. So in 1831, soon after the treaty, Black Hawk and his war party, according to Indian custom, retaliated by attacking and killing twenty-seven Menomouees near Fort Crawford, Prairie du Chien. General Joseph Street, the United States Indian agent there, on complaint of the Menomouees, demanded the surrender of those Sac murderers for trial under existing treaty provisions.”

  1908-brown-rock-county/03-black-hawk-war.md, Vol. 1, PDF p. 46 / book p. 37

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources