Any defending naval unit in the sea zone where transports unload prevent shore bombardment from that sea zone.

They have one weak naval unit, along with several infantry divisions, and some obsolete air units.

If they do this, combat will occur on your enemy's turn immediately following yours unless the enemy player moves its naval unit out of the ocean/sea zone.

Coastal fortresses may no longer be bombarded by naval units.

In all cases, submarines were only able to hit other naval units.