31373 Army of the Potomac Pioneer No.131373 1 30 Scale Matte Finish Single Figure Engineering and pioneer soldiers played an important part in the American military since its beginning. The primary role of pioneer units was to assist other arms in tasks such as the construction of field fortifications, military camps, bridges, and roads. At the Battle of Stones River, Pioneers played a key role in halting the Confederate advance. Fortifying their line with hasty works, ditches, and