From the release:
To help you fight your American Civil War battle Blue Moon has just released the “Black Hats” . We have 2 codes of 15/18mm Iron Brigade packs finished and ready to go.
15ACW-101 Iron Brigade Advancing - 30 figures per pack for $15.00
15ACW-102 Iron Brigade Firing Line - 30 figures per pack for $15.00
There will be more Blue Moon releases coming soon so keep watching for more releases.