Union officer (1811–1888) who fought in the Maryland Campaign as well as South Mountain and Antietam. He was later named as the provost marshal for the Army of the Potomac. Original 2.25 x 4 carte-de-visite photo by Gardner of Washington, D. C., signed in the lower border in black ink, “M. R. Patrick.” In fine condition, with clipped top corner tips. RR Auction COA.