Prisoners for a brigade?

[willdaboss]

Ok, so i captured almost 10k troops during the battle of Antietam(sweeping the CSA flank), and after the battle i got the iron brigade. Are there other brigades that you get after capturing a bunch of men?

[pandakraut]

The Iron Brigade is a reward for winning Antietam. The only other case where this occurs is for the CSA at Shiloh where you can get Forrest's Brigade. 

Capturing enemy units will give you extra recruits as a reward, though the max amount is capped at 1000.