I've been playing this scenario on 'Normal' difficulty on my iPad for a week ... And the result is always exactly the same. It doesn't matter what strategy I employ, the Confederate brigades invariably end up overwhelming and routing my Federal Army completely. I played once on 'Easy' difficulty, and I actually got destroyed even sooner.
It's frustrating for two reasons: terrain and obstacles (stone fences, tree lines, etc.) don't seem to slow advancing troops down on either side. Plus, there is a propensity of certain Federal Corps units (Biddle, Ames, the Gibralter and Bucktail Brigades especially) to break ranks, and flee too readily and too far back of the front lines to be of much use as the battle progresses. Even the morale of the Generals doesn't seem to work very well.
I had read that losses were supposed to be carried forward based on the entire campaign scenario: that isn't the case with the iPad version. In a previous battle, I absolutely crippled the Confederate Army and thoroughly destroyed Iverson and Pettigrew (ran them clear off the map) - yet both brigades returned to full strength for the July 2 7:30 pm Night Attack scenario.
Obviously, Confederate dead had risen and become the Undead Rebel Zombie Hordes of Texas and Alabama. Regardless, it's a wee bit irksome.
If anyone has a bugle-to-bugle strategy for defending Cemetary Ridge and Culp's Hill successfully in this scenario, I'd love to know it.