Abraham Lincoln and his company reached General Atkinson at the mouth of Rock river and were mustered into United States service; the militia were placed under Brigadier General Samuel Whiteside.

The evidence

• “May 7, 1832, Abraham Lincoln and his company reached General Atkinson at the mouth of Rock river and were mustered into the United States service. Lieutenant Robert Anderson, of the regulars (later the hero of Fort Sumter), was detailed inspector general of the Illinois militia, about 1,600 in all, who were placed under Brigadier General Samuel Whiteside, an experienced Indian fighter, and accompanied by Governor Reynolds as major general.”

  1908-brown-rock-county/03-black-hawk-war.md, Vol. 1, PDF p. 49 / book p. 40

  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