What do I need to do to blockade a port?
For example, at Norfolk the tooltip says that the harbor has two exit points - Hampton Roads and James Estuary.
So are these two regions the only ones I need to blockade to blockade Norfolk?
Or do I need to blockade Cape Henry too, which touches Norfolk region but is not listed as a harbor exit point?
Oh, and one more thing - is there any visual clue as to whether a port is being successfully blockaded or not?
Thanks