The history of Fort Connah is steeped in the politics and realities of the fur trade in North America. The Fort Connah post, originally located near Thompson Falls, MT and known as either the Flathead Post or Salessh House, was built in 1809 by David Thompson and James McMillian of the Northwest Company. Flathead House was later merged into the Hudson Bay Company. Angus McDonald was promoted to command the Flathead House in 1847, where he assumed responsibilities from Neil MacArthur. It was decided that the post location was better suited for the Mission Valley where it stands today.

There are a number of books and manuscripts about both Fort Connah and Duncan McDonald. Links to those resources can be found below.
AngusMcDonaldAngus McDonald (1816-1889)
Books and resources about Angus McDonald, Fort Connah and the fur trade in North America

Glencoe and the Indians : a real-life family saga which spans two continents, several centuries and more than thirty generations to link Scotland’s clans with the native peoples of the American West. Edinburgh: Mainstream. 1996 ISBN 1-85158-829-9.

Angus McDonald of the Great Divide Museum of North Idaho ISBN 978-0-9825220-2-8

Fort Connah: A Page in Montana's History Stoneydale ISBN 1931291187

Scottish Highlanders, Indian Peoples: Thirty Generations of a Montana Family ISBN 978-0917298523

The Washington historical quarterly, Volume 8

Uncharted Territory: David Thompson on the Columbia Plateau

Guide to the Angus and Catherine McDonald Papers 1858-1899 University of Montana Mansfield Library

National Register of Historic Places