Bunkers Trenches Improved Positions

[Plain Ian]

My understanding why positions downgrade when evacuated is down to maintenance. If a position is not occupied then its defenses are not being maintained or kept ready, so they degrade slightly. 

So if you leave a Trench (-40%), it becomes a Trench (-20%) for both sides.

Since I'm not in the military/armed forces then I do not know how realistic this is but as Elxaime says that's the rules.

Having said this I'd prefer that friendly fortifications retain the same defense levels if they are evacuated but subsequently reoccupied by friendly forces. IF they are occupied first by enemy forces THEN then they downgrade.

But its not a big issue for me.