In a current AI game, I invaded KY as the USA in August 61 and took possession of the entire state.
However, in Nov, the game announces that the CSA has conducted a pre-emptive invasion of KY, and lo!: there are CSA units (volunteers) all over the state, including in towns far from the front that I was no longer garrisoning.
Hard to figure out how the AI could invade after I had done so quite a while ago. I seem to recall a thread on this but couldn't find it.
I'm playing 1.16rc4a.
Any ideas?