The Union cavalry near the bridge is supposed to be an artillery.
I do think it is interesting that RBorg added a Confederate Infantry in reserve at Jackson's position, and removed a Union Infantry from Franklin's Corps. It seems a little strange, given the actual sizes of the armies (120,000 US vs 114,000 CS), that the forces in the scenario should be about even, but I suppose he is partly trying to represent the fact that Franklin refused to use VI Corps that day.