Re: 3rd. missouri calvary CSA
Jim: Your ancestors appear to have served in the 3rd Missouri Cavalry Regiment, commanded by Col. Colton Greene. This unit was formed in the fall of 1862 and became a part of Marmaduke's Cavalry Brigade. Its service was entirely in the Trans-Mississippi Department.
The 3rd Missouri Cavalry Battalion (Dismounted), often confused with the above outfit, fought primarily east of the Mississippi River.