The Union right, the north side of the battlefield. Because of dense terrain, the rebs were a little scattered on this front. The Union's goal was to mass firepower and take out their opponents piecemeal.
This is the other end of the battlefield, the Union left. A small brigade of colored troops tries to take a well-defended railroad bridge.
This is the center of the battlefield, where a strong Union brigade tries to storm across the creek before the Confederates can bring up their reserve units.