This mission ended up being very close at the end. If 20 turns passes the mission is failed. I spent some time redoing an old mission to level up and unlock the sniper class.
There was definately some back and forth as I was confused about where enemy re inforcements kept coming from, which bases linked to which areas and things like that. I would take over areas than move on, and the enemy would take them back. This happened alot. Still learning some of the details. The original on PS3 was one large area from what I remember. This game breaks it up and it can be confusing where areas link to.