Can river movement from Fairfax into Washington be blocked by Gunboats in the Potomac? I see that the movement is river movement, but the "Potomac region" only seems to go about half way up the "river" between Fairfax and DC?
This question stems from a game where I had two Ironclads in place, but the CSA managed to move across. The Ironclads only provided two elements and if I understand the current river blocking implementation, this would have only provided a 50% change of blocking movement.
But for future games, I want to know if four elements would provide 100% blockage or if they have no effect and that needs to be taken into account.