RE: Is assaulting Bunkers too hard ?
Bunkers and pillbox hexes are an abstraction of in this case probably platoon-sized strongpoints in a hex. They're a one size fits all category, so the bunkers overlooking the beaches are the same as log bunkers inland.
The bunkers overlooking the beaches had an excellent view of the beach but were vulnerable from the rear, like most bunkers, but they were protected by a trench system. As long as the trench system could be held, the occupants of the bunker were fairly safe. As the trench system is in the same hex, it's difficult to represent a bunker being overrun by infantry with grenades, satchel charges or flamethrowers, as the trench system and the bunker are in the same hex. Supporting bunkers further back might also be in the same hex.
Adding a facing might be problematic as you'd need to determine the direction the attack is coming from for each bunker, and it wouldn't be possible if the bunkers were player-created, unless a pop-up screen would appear to select facing when the engineers have created a bunker.
With such a fluid battlefield, determining what "behind" is will be difficult, unless it's a rule like "defenders face penalties when attacked from a different direction than the one they are first attacked from during a turn".
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