Established in 1852, Fort Clark was manned by varying troop strengths over the years. This guardhouse was built in the 1870s during a period of fort expansion. A new stockade was built in 1942 to relieve overcrowding, and the guardhouse became headquarters for the military police. Built of limestone blocks, the building reflects an adoption of military design to local materials and climate, and retains its 1930s appearance. Recorded Texas Historic Landmark - 1962