I did 3 months at the War College studying this battle. When I was in the service they divided the classes up by groups of 30, 20 officers 10 NCO's, I was one of the nco's. Then they gave each group a battle to digest/pick apart that culminated in to a mass conflag, in other words, make your own decisions.
So that was 30 for the union, 30 for the confederates, and there were 10 classes, 300 of us in all. We got Gettysburg, or I should say, I was assigned to the union Gettysburg group.
After completing the 3 months, we got to meet in a weekend event, all 300 of us, the Antietam group sounded like the most engrossing as they had much more derailed decisions to make tactically. And the civil war wasn't the only class subject matter, some got other historical engagements. The underlying themes back then were "first time doctrine absorbing or first time doctrine initiating" battles. After the 3 months, we then did a follow up 1 month of service branch specific doctrines. I ended up in the central Solomons 43/44 for that one. Very underwhelming after the Gettysburg group.