In addition to his service in the 2nd. Miss. Cavalry, your Daniel Harkey had prior service (5 cards) as a 2nd. Lt. in Company B, (E. B. Howard's CO), 1st. Battalion State Troops Miss. Infantry (12 months, 1862-3).

See 1ST (HARPER’S) BATTALION MISSISSIPPI INFANTRY MINUTE MEN at this site -
http://mississippiscv.org/MS_Units/minute_men.htm