Herodotus

Surrendering for me is a big one, along with mount/dismount cavalry and limbering/unlimbering artillery. Surrendering Units is a must-have though. Also have to include killing/taking prisoner of generals and other commanders for historical authenticity as they were almost always in the front line of attack and were killed, badly wounded or taken prisoner (all three occurring to General Armistead, though not in that order obviously ).

True, but if like Empire's "The American Civil War" (not as detailed of course, as you'd miss too much on the real time battles) then copyright infringement isn't an issue. Several Civil War and Napoleonic games from the '90's and early noughties implemented this (mostly) successfully, but not completly so. Even "The Civil War", developed by the same team who made "Fields of Glory" (the closest I can get to "UG:G") had to make the real time battles simplistic, and awash with problems I might add, and it did not work. Spent the entire game auto-resolving battles. So really, it can only be one or the other unless you have a huge budget from a coffer-filled publisher.

Cautious you'd imagine would be the easiest setting against the Confederates, but as they sit by their cannon wiping out any challenge to VP's it's the least enjoyable. If only the Union weren't so gunshy when it came to capturing artillery batteries (which isn't an option but could and should be...in fact where is the prisoner count?) retreating in the face of one or two solid shot volleys where the South just keep coming no matter the vollies from Union barrels.