In Axis and Allies: D-Day they have the very piece you speak of.
It says the following:
Blockhouses (Axis only)
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.