It appears that the battery lost a gun at Okolona. Knispel is still working with the battery still identified as 4 12 pound mountain howitzers of the 4th Missouri Cavalry as late as August 27 1864 during the Allatoona Campaign

http://ehistory.osu.edu/osu/sources/recordView.cfm?Content=077/0391

You'll need to page up to page 392 for the rest of the note.

I'll keep working on it but it appears it remained a battery of the 4th Missouri Cav by designation.

John R.