On turn 1, I captured the fort.

On turn 2, I left a garrision of one full-strength militia unit, one full-strength artillery unit, and the one 1-gun captured heavy artillery unit.
On turn 4, apparently the Fort Sumter reinforcement event trigger. What is interesting about it is that it indicated that the USA recaptured the fort; however, there was no battle display showing the combat. My units ended up outside the fort with the USA inside.

Am I mistaken in believing that there should have been a battle and that I should have seen a battle display?
Thank you,
CptCav