Playing as CSA I have built a fort in New Orleans. I used the 4 artillery and 2 supply wagons in my stack that was (inside) the city. I also had a stack entrenching outside the city. Now the fort is complete both stacks say they are inside the fort in Iberville, which is the region I think. What has happened here ? When I try to drag my field force into the region it stays there for a couple of seconds and then moves back over the city and says it's still inside the fortress.
What I wanted was the city itself to become the fortress and an additional force heavily entrenched outside the city. I dont want my field force bottled up in the city.
What really are the point of fortresses as the attacking force can simply besiege rather than being forced into an offensive posture and having to attack a very high level entrenchment ?