Fort Wyman was an earthen fort built by the Union Army near Rolla, Missouri during the American Civil War. Rolla had been captured by General Franz Sigel on June 12, 1861 and from that date throughout the Civil War it remained in Union hands for President Abraham Lincoln had issued an order: "By all means hold Rolla." Rolla was the westernmost supply depot in Southern Missouri being at the Western Terminus of the Pacific Railroad at that date. Following the Union defeat at the Battle of Wilson's Creek on August 10, 1861, the Union Army fell back to Rolla and began building an earthen fort on the top of a hill alongside the present Highway 63 about a mile from the Courthouse. The rectangular fort had a dry moat around the perimeter with 32-pound field pieces located on each corner of the fo