Sorry if this has been done to death.
I'm struggling with this. I can (sometimes) place my units behind a wall to use it as cover, but I can only put them on one side of the wall and not the other.
This is OK if the enemy are coming from that direction, but its crazy if they are coming at me from behind and I cant get my units to go the other side of the wall.
I hope that all makes sense - anyone else having the same problem???