My 2nd great grandfather John Norris and your gg grandfather's were in the same unit.
My 2nd great grandfather's record says 6th Cavalry Muster May 3, 1862 Shreveport La by WB Denson, 3 yrs, 1 horse.
John Norris was captured Nov 5, 1864 and sent to Alton Prison. My great aunt was told by John Norris that they did fight in different battles. I just don't know which ones.