The Third Wisconsin Cavalry left camp for the southwest; the Thirteenth Regiment's companies left Camp Treadway at Janesville for the front.

The evidence

• “Ex-Governor William A. Barstow was the colonel of the Third Wisconsin Cavalry, which left camp here for the southwest, March, 1862.”

  1908-brown-rock-county/26-history-of-janesville.md, Vol. 2, PDF p. 47 / book p. 560

  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