[quote=Byrd Man]
So, the CSA are setting slaves free and giving them guns to serve in the army that wants to keep slavery going? I don't want to nitpick, but I imagine Aegon had to have rolled really, really high for that to have as little blowback as it did.
[/quote]

It is historically accurate.

[url=http://en.wikipedia.org/wiki/Slaves_and_the_American_Civil_War#Blacks_in_the_Confederate_Army] Blacks in the Confederate Army [/url]

There are some differences, but nothing too different.