can someone please explain how i should understand this part of the manual:

Just for example, if normal stacking is exceeded, then this effects what ?
I dont understand what Attack (ATT) means.
If i understand correctly then this effects the hitpoints of attacker and defenders in the same way.
And about entrenchment, if i understand correctly then any type of terrain has a auto-entrenchment level (lets say 10).
And with every round it goes up with +... points and max is, lets say 100 points.
But how can i now how much it goes up every round ?



