The situation is this:
Me as the USA am under seige in Alexandria which has a fort and 95% ZoC and in Loudon I have another large force with a ZoC of 100%.
Now I wish to break the Seige without engaging in combat. If I move a unit outside of the fort I see it breaks the seige because the icon goes away. AND presumming that the CSA is in Def stance will this start combat. Or does moving a unit out to a area with 100% Zoc start combat?