I ended up buying it and this is really good fun. First try as the union and gave up a ton of ground the first day although got some good kills decide to defend from the town itself, second day some minor skirmishing, gives me a defeat and I move south, third day kicked some rebel ass, repulsed a halfhearted attack and drove them back to the town, battle ended as it's turning into a rout, and... I lost the battle because the ground they took on the first day was worth so much
for some reason my pc took a picture of the start menu instead of the results screen but, 25k rebels vs ~12k union soldiers is a pretty good trade to me considering the results of the real battle, with what was left of a brigade surrounded and cut off from the rest of the rebel army, too bad theres not a fourth day haha, might not have been "relieved for my terrible performance"
Overall very impressive for an early access (same thing as beta?), only bug I can see is that artillery seems to have ridiculous amounts of health, which really sucks because if you assault something you get your men bunched up a bit, so the artillery reacts and sits on the best vantage point which is what it should do, its just now you have ~6 units on a hill that will rout your men before they can charge and will survive many volleys while murdering units with grape shot.