Dunn was commissioned as secretary of the Territory in place of William B. Slaughter.

The evidence

• “Dunn, appointed by Martin Van Buren, was commissioned in place of William B. Slaughter, as secretary of the Territory, on the 25th of January, 1841, but was himself superceded by the appointment of A. P.”

  1879-history-of-rock-county/01-wisconsin-antiquities-indians-territory.md, PDF p. 45 / book p. 49

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

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