Undated photograph of a white mule, cart and driver; written below the photograph is “Here’s Your Mule”, *Cart*Driver* Ft. Leavenworth, KS.”

Built in 1827, Fort Leavenworth was the oldest active military installation west of the Missouri River. During the Civil War, Leavenworth was used as a mustering and training area for Kansas volunteers and as a supply depot.

Carte-de-Visite by T. L. Rivers, St. Louis, Mo.

Image Courtesy Wilson’s Creek National Battlefield; WICR 31771