A view of construction at Fort St. Anthony, now known at Fort Snelling, in 1823. Originally, Zebulon Pike treatied for this location at the confluence of the Minnesota and Mississippi Rivers in 1805. It wasn't until 1819 that the U.S. military established a site, when Colonol Henry Leavenworth moved his Fifth Infantry Regiment from Detroit to the site. Many soldiers reported extremely poor conditions at the fort, but things improved a bit with contruction of soldiers' quarters 1823. For a breakdown of the map, see here
