Dakota leader Sakpedan (Little Six, “Shakopee III”) at Fort Snelling, 1864.

Fort Snelling, c.1865.

View of the south side of Fort Snelling showing the gatehouse and shops, c.1864.

General George N. Morgan reviewing Veteran Reserve Corps troops at Fort Snelling, 1864.

Members of the First Minnesota Mounted Rangers in front of temporary barracks outside the walls of Fort Snelling, 1864.

Colonel George McLaren, c.1864. McLaren was a commandant of Fort Snelling during the Civil War.

Colonel George N. Morgan, 1863. Morgan was the second commandant of Fort Snelling during the Civil War.

Exterior view of Fort Snelling showing the Round Tower with a conical roof, 1863.

Graphite drawing of Fort Snelling, 1863.

Dakota boy at the concentration camp below Fort Snelling, 1863. Photograph by Whitney’s Gallery.