31, 2011 July 31, 1856: Fort Lookout Established North Of Chamberlain Posted by Todd D. Epp at 12:28 AM On this date, July 31, 1856, Captain , later Brigadier General, Nathaniel Lyon, United States Army, established Fort Lookout north of present-day Chamberlain. An excerpt from Frontier Forts: Frontier Forts: Random Observations