"Fort Plymouth"@en . "The construction of Fort Plymouth began in summer 1856. The site was settled by a group of free-state partisans who entered Brown County from Nebraska Territory. This site was also meant to become a free-state town, but possibly only one house was constructed on the site. The fort, named after Plymouth Rock by surveyors from Massachusetts, was located on or near the top of a high hill north of Pony Creek."@en . . "summer to October 1856 (never completed)" . .