Sept 1863: Message arrives "The Two Liverpool Rams --- CSS Scorpion and CSS Wyvern are Under Construction in Great Britain" or some such.
I check the GB box: Nope, not there.
Search around a bit, and come across them in Wilmington, NC. Locked down, but fully built, and "available in 2 turns".
Now, am I correct in assuming these two riverine ironclads magically appear in the Continental US, because game mechanics don't allow them to sail across the Atlantic?