Guys, just to settle down the problem with coastal guns. I've seen the discussion now is about air interdiction of troops. Maybe the game treats interdiction and bombardment differently in that case, yet the manual says nothing about it. But regarding coastal guns, we can fall into the trap of taking the game as an oracle which messages must be interpreted and justified. Even if I don't know anything about naval warfare, there is clearly a bug with counter fire against coastal guns interdiction.
As you can see in the image attached, they can survive bombardments from a naval vessel for 9 rounds, here. They would be eliminated in one round by the counter fire of the same naval vessel after they try to interdict it, as noted in the first post of the parallel thread (http://www.matrixgames.com/forums/tm.asp?m=4591514). Notice that here we can't justify it by saying the guns are dispersed or housed when idle, for the simple fact that in both situation they are actively firing. When interdicting, they fire first and suffer counter fire; when bombarded, they counter fire themselves (see the damage caused B(1) in the picture).
Maybe the problem is just with coastal guns. Maybe it is extending to other parts of the game, but it is important to notice that here, the problem isn't that the interdiction fire is more effective, but that the counter fire against interdicting coastal guns is infinitely more effective. The interdicting unit is the one being eliminated.
I'd add that this bug reported by Cabido is 100% repeatable using any other scenario.