In Axis and Allies:  D-Day they have the very piece you speak of.

It says the following:

Blockhouses (Axis only)

Attack:3
Defense: 1
Move: -

Special Abilities
Fire to Sea:  Blockhouses can make a special targeted attack against the beachheads, when so directed by an order car. Each blockhouse may fire once at an Alllies land unit in a beachhead box within its firing arc, indicated by an arrow (See Special  Combats on page 13 for more information.

~Bull Halsey

I simply used the money from one of my previous A&A games. I prefer it for when I have left over from the previous turn.

Capital Ships can be “damaged” and yet remain alive. Do they HAVE TO go get repaired or can they carry on into new combat on their side and thus, be sunk with only one hit?