Had a happenstance that is making me question my understanding of the game again.
As the Union. I sent a division on ship to Savannah and off loaded them on the Atlantic Coast side of the region. (i.e. I did not sail past the fort into the river) The group landed and for two turns sat there with no siege icon an no log entry about battles or anything. Per the tool tip, there were rebel forces in the city. I then moved the fleet into the river area next to Savannah and I got the seige symbol. From that point, the seige continued as i would expect
My three explanations I can think of are:
-its a bug (likely)
-its because I landed on the Atlantic Coast side (does not make sense, could also be true AND a bug)
-I need to "close the seige" by blockading the port. (realistic I guess, but not how I have seen things work)
-I completely misunderstood or missed something and the seige was happening the whole time and I should go to bed at a more practical time.
Anyone?