The Union don't know it, but Jackson has Ewell's division coming down a back road just out of shot on this side of the battlefield. Jackson doesn't know when Ewell will arrive - the earliest is 1/2 an hour playing time after the battle starts, but the actual time of arrival has been pre-determined by the umpire & kept secret.
The CSA cavalry had run of bad command dice, missed the chance to take out the Union artillery & got shot up by the infantry in the woods. Some hot shooting by the Reb gunners on the far flank forced the Union guns on the pike to retreat & the Union left is under pressure.
We now go back to email campaign mode to work out what happens next.