I cannot answer that question with any degree of certainty.

I did not notice any mention of Brown's Battery in the report of the raid.

However, Marmaduke's report mentions that his force had 8 field pieces and 2 mountain guns. Without checking, I assume that Collins's battery of Shelby's Brigade had four cannons, and it is likely that Pratt's battery of Carter's Brigade of Texans also had four pieces. That does not account for the two other weapons he reported having on the raid. Could those two pieces have been a section of Brown's Battery attached to Greene's Brigade? [In a previous message it is indicated that the battery was with Greene on May 20, 1863, after the raid.]

On the other hand, it seems that if the battery had participated in the raid that Coker would have provided more details, assuming, of couse, that he went with it.

Trying to sort out all of these units is fun isn't it? Been there and done that with Missouri's units.