Darden lived in Edwards, a federal army Corps (XIII) had been poised to strike Edwards for two days, and another (XV) had moved astride the direct road from Raymond to Edwards. So there's no good explanation for Darden being in Raymond unless he was serving with Hall's State Troops, especially since, at 43, he was under the maximum age (45) for conscription.
It's the alleged artilleryman, William Delan(c)ey, that I'm curious about ... his unit designation on the prisoner record appears to be "1st Tennessee Battery" which doesn't make any sense. Did he simply make up a unit when asked? Was he part of a battery in the area, but the unit designation got screwed up?