Is assaulting Bunkers too hard ?

[wiggum]

Are you using the tanks to shell the bunker before your assault? In the intro campaign I found that the tanks were powerful can openers. Doesn't address your question, of course - you think 180 D quality combat engineers ought to be able to take an already thrice-assaulted bunker containing guns and ten men who are in good order. History can provide examples of numbers like that not succeeding immediately, though. Not sure it's clear cut. How many losses did you take over your four unsuccessful tries?

Peter

Yes, i used the tanks right before the assault to shell the bunkers.
Of course, it could happen in reality but after 15 test assaults with no success it looks like its the most likely result that the assault fails and not some "bad luck" thing.
The four unsuccessful tries befor my 15 test assaults resulted mostly in very light causalities 1-3 men.

Another bunker to the south, containing only 5 men of "E" moral and 2 Guns of "D" moral fought off a assault by 9 tanks (Moral "B" and 65 Inf (Moral "C").

Yes, a assault can bog down easily in reality when confronted by a few well dug-in men and guns . But its also true that the 10 defenders would most likely surrender or route if already over 50% of their unit are WIA and KIA and assaulted again by 180 guys with nasty toys.
You have only so many turns and VP's on bunker hexes with a crew that fights to the last man even when confronted with overwhelming force and surrounded can be really annoying.