Below is the report in the ORs suggesting that wounded were killed by Willett's Battalion, 14 KS Cav.

Brig.Gen. S.B. Maxey to Lt.Gen. E.Kirby Smith
February 26, 1864
...
The Seminole battalion fought them with inferior numbers, losing 11 men; no wounded left on the field. I am officially advised that the bodies of these men were mutilated, their throats cut from ear to ear, and they were thus left on the field. One company, Nail's Chickasaw and Choctaw, was engaged, losing 4 men included in the above. These inhuman outrages were committed by the white troops; no Indians on their side in this fight. On their march they fired into a camp of poor fugitives, killing a child about ten years old and a woman.
...
Official Records Series I. Vol. 34. Part II, Page 994