What happens to the Tobruk fort level when Tobruk is captured? I've found nothing about this. If I understand correctly, the occupying power gets Tobruk at that fort level, and the only time besides battle the level goes to zero is when the active map changes.
I want to confirm if my understanding is correct.
Yes this is correct.
usually when Tobruk is captured the Fort level will be Zero, but I have seen it happen sometimes where there are points remaining: Indeed they stay there even if the ownership of the Fort changes.